CN212516256U - Teaching aid for exploring expansion with heat and contraction with cold of liquid - Google Patents

Abstract

The utility model discloses a teaching aid for exploring expansion with heat and contraction with cold of liquid, which comprises a transparent bottle, a tubular measuring part, a thermometer, a cold liquid cylinder and a hot liquid cylinder; colored liquid is filled in the transparent bottle and is respectively placed in the cold liquid cylinder and the hot liquid cylinder; the tubular measuring piece is provided with scales and is inserted into the colored liquid of the transparent bottle, and the bottom end of the tubular measuring piece and the bottom end of the transparent bottle are suspended in the air; the thermometers are detachably arranged in the cold liquid cylinder and the hot liquid cylinder; the cold liquid cylinder and the hot liquid cylinder are respectively filled with cold liquid and hot liquid, and probes of thermometers are arranged in the cold liquid and the hot liquid. The experimental apparatus of the teaching aid can be repeatedly used, so that the cost is saved; the rubber cover can be replaced to ensure the sealing property of the glass bottle after the teaching aid is used for many times; the thermometer can measure the temperature of the liquid in the liquid cylinder, and more scientifically provides verification that the expansion and contraction of the liquid are caused by temperature change; the liquid jar is the plastics material, and the experimental apparatus is safe easy to operate, can let the student oneself operate and explore the study.

Description

Teaching aid for exploring expansion with heat and contraction with cold of liquid

Technical Field

The utility model relates to a scientific teaching aid field of primary school especially relates to a study teaching aid of liquid expend with heat and contract with cold.

Background

Expansion with heat and contraction with cold refer to the property that an object will expand when heated and contract when cooled. Because the movement of particles (atoms) in the object can change along with the temperature, when the temperature rises, the vibration amplitude of the particles is increased, so that the object expands; however, as the temperature decreases, the amplitude of the particle vibration decreases, causing the object to contract.

In the third lesson of thermal expansion and contraction of liquid of the second unit of thermal textbook of the fifth grade of the primary school scientific textbook, the teaching materials are that a test tube is sleeved with a balloon to observe the size of the balloon, and the test tube filled with red ink is inserted with a glass tube and placed in a beaker filled with hot water or cold water to observe the height of the red ink. In the operation, because the inner diameter of the test tube or the glass tube is larger, if the temperature difference between cold water and hot water is not large or a plug is not plugged tightly, the experiment phenomenon is not obvious, and experiment errors are caused; and the temperature of water in the beaker cannot be accurately sensed, and the specific height of the red ink rising cannot be quantified, so that the experimental teaching effect is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model aims at providing a teaching aid simple structure, installation convenient to use, experimental effectual to current primary school's science teaching aid demonstration effect not good, the operation is inconvenient, easily cause technical problem such as error.

In order to realize the above purpose, the utility model discloses a technical scheme:

a teaching aid for exploring expansion with heat and contraction with cold of liquid comprises a transparent bottle, a tubular measuring part, a thermometer, a cold liquid cylinder and a hot liquid cylinder;

the transparent bottle is filled with colored liquid and is respectively placed in the cold liquid cylinder and the hot liquid cylinder; the tubular measuring piece is provided with scales and is inserted into the colored liquid of the transparent bottle, and the bottom end of the tubular measuring piece and the bottom end of the transparent bottle are suspended; the thermometers are detachably arranged in the cold liquid cylinder and the hot liquid cylinder; the cold liquid cylinder and the hot liquid cylinder are respectively filled with cold liquid and hot liquid, and probes of thermometers are arranged in the cold liquid and the hot liquid.

Further, a rubber cover is installed on the bottle opening of the transparent bottle, a through hole is formed in the rubber cover, and the tubular measuring piece is inserted into the through hole.

Further, still include the fixed rod of limiting plate and thermometer, the limiting plate sets up respectively on cold liquid jar and the hot liquid jar diapire, the limiting plate constitutes with cold liquid jar and hot liquid jar lateral wall and makes the fixed rod male mounting hole of thermometer, the fixed rod of thermometer is the L type, and one end inserts the mounting hole, the other end is connected the thermometer, the probe of thermometer inserts perpendicularly in cold liquid and the hot liquid.

Further, the transparent bottle is a glass bottle.

Further, the tubular measuring part is a sucker with scales, and the inner diameter of the sucker is 1-2 mm.

Further, the thermometer fixing stick is made of plastic.

Furthermore, the cold liquid cylinder and the hot liquid cylinder are made of plastic.

Further, the cold liquid cylinder and the hot liquid cylinder are both in a cuboid cavity structure.

The utility model has the advantages that:

1. the experimental apparatus can be repeatedly used, and the cost is saved.

2. The rubber lid is removable to guarantee the seal of teaching aid repetitious usage back glass bottle.

3. The inner diameter of the suction pipe is set to be 1-2mm, and the expansion with heat and the contraction with cold of the liquid can be visually and clearly observed by slight change of the temperature; meanwhile, the suction pipe is provided with scales, and whether the expansion with heat and contraction with cold occur can be judged through the scales of the liquid column.

4. The thermometer can measure the temperature of the liquid in the liquid cylinder, and more scientifically provides verification that the expansion and contraction of the liquid are caused by temperature change.

5. The liquid jar is the plastics material, can not smash, and the experimental apparatus is safe easy to operate, can let student oneself operate and explore the study.

Drawings

FIG. 1 is an assembly diagram of the experiment of the cold liquid cylinder of the present invention;

FIG. 2 is an assembly view of a hot liquid cylinder experiment of the present invention;

in the figure: 1. a transparent bottle; 2. a tubular measuring member; 3. a thermometer; 4. a cold liquid cylinder; 5. a hot liquid cylinder; 6. a rubber cover; 7. a limiting plate; 8. a thermometer fixing stick; 9. and (7) installing holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further explained with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A teaching aid for exploring expansion and contraction of liquid with heat is shown in figures 1 and 2 and comprises a transparent bottle 1, a tubular measuring part 2, a thermometer 3, a cold liquid cylinder 4 and a hot liquid cylinder 5; the transparent bottle 1 is filled with colored liquid and is respectively arranged in a cold liquid cylinder 4 and a hot liquid cylinder 5; the tubular measuring piece 2 is provided with scales and is inserted into the colored liquid of the transparent bottle 1, and the bottom end of the tubular measuring piece 2 and the bottom end of the transparent bottle 1 are suspended; the thermometer 3 is detachably arranged in the cold liquid cylinder 4 and the hot liquid cylinder 5; the cold liquid cylinder 4 and the hot liquid cylinder 5 are respectively filled with cold liquid and hot liquid, and probes of the thermometer 3 are arranged in the cold liquid and the hot liquid.

The transparent bottle 1 is a glass bottle and is used for containing colored liquid and observing expansion with heat and contraction with cold of the colored liquid. The transparent bottle 1 can be similar to a bottle with the same width as the oral liquid, and the diameter of the bottle is 1-3cm, so that the volume of the colored liquid in the transparent bottle can be reduced, and the temperature can be increased/decreased more quickly. The tubular measuring element 2 is used for measuring the height change of the liquid column caused by the expansion and contraction of the colored liquid. The thermometer 3 is used for measuring the temperature of the liquid in the liquid cylinder. The cold liquid cylinder 4 and the hot liquid cylinder 5 are used for containing cold liquid and hot liquid, so that the temperature of the colored liquid in the transparent bottle 1 is changed, and the colored liquid expands with heat and contracts with cold. The cold liquid cylinder 4 and the hot liquid cylinder 5 are made of plastics and both have cuboid cavity structures.

As a preferred solution of the present embodiment, as shown in fig. 1 and 2, a rubber cap 6 is installed on the mouth of the transparent bottle 1, a through hole is provided on the rubber cap 6, and the tubular measuring member 2 is inserted into the through hole. The rubber cap 6 on the one hand seals the transparent bottle 1 and on the other hand facilitates the mounting and fixing of the tubular measuring element 2. The tubular measuring part 2 is a sucker with scales, and the inner diameter of the sucker is 1-2 mm.

As the optimization scheme of this embodiment, as shown in fig. 1 and 2, the thermometer fixing device further includes a limiting plate 7 and a thermometer fixing stick 8, the limiting plate 7 is respectively disposed on the bottom walls of the cold liquid cylinder 4 and the hot liquid cylinder 5, the limiting plate 7, the side walls of the cold liquid cylinder 4 and the hot liquid cylinder 5 form a mounting hole 9 into which the thermometer fixing stick 8 is inserted, the thermometer fixing stick 8 is L-shaped, one end of the thermometer fixing stick is inserted into the mounting hole 9, the other end of the thermometer fixing stick is connected to the thermometer 3, and a probe of the thermometer 3 is vertically inserted into the cold liquid and. The thermometer fixing stick 8 is made of plastic.

The limiting plate 7 is used for inserting the thermometer fixing stick 8, and the thermometer fixing stick 8 can be conveniently installed. Preferably, the limiting plate 7 is arranged at one corner of the liquid cylinder with the cuboid cavity, and two side walls of the liquid cylinder and the limiting plate 7 form a mounting hole 9 for inserting the thermometer fixing stick 8. The thermometer fixing stick 8 and the thermometer 3 can be connected in a plurality of detachable modes, for example, a mode of binding a rope is adopted, the upper end of the rope is connected with the thermometer fixing stick 8, and the lower end of the rope is connected with the thermometer 3; the installation mode of the tubular measuring part 2 can also be adopted, a rubber hole is formed in the thermometer fixing rod 8, the thermometer penetrates through the rubber hole, and the bottom end of the thermometer fixing rod is inserted into liquid in the liquid cylinder, so that the thermometer is convenient to install.

For better understanding, the utility model discloses, following is to the theory of operation of the utility model make a complete description:

1. taking out the two glass bottles 1, filling the two glass bottles 1 with the colored liquid, covering the bottle openings of the two glass bottles 1 with the rubber covers 6, inserting the tubular measuring piece 2 of the suction pipe into the rubber covers 6, and inserting the bottom end of the suction pipe into the colored liquid of the glass bottles 1.

2. Thermometer fixing sticks 8 are respectively inserted into mounting holes 9 at the corners of the cold liquid cylinder 4 and the hot liquid cylinder 5.

3. The cold liquid tank 4 is filled with cold water or ice cubes, and the hot liquid tank 5 is filled with hot water.

4. On the thermometer holders 8 of the cold liquid tank 4 and the hot liquid tank 5, thermometers 3 are mounted, and the lower parts of the two thermometers 3 are immersed in the liquid in the two liquid tanks.

5. The height of the liquid column of the pipette 2 in two different glass bottle assemblies (glass bottle 1 containing colored liquid, pipette 2 with scale, rubber cap 6) was observed and recorded.

6. Two different glass bottle assemblies are respectively and vertically placed into the cold liquid cylinder 4 and the hot liquid cylinder 5, and the scales of the colored liquid in the suction pipe are observed and respectively recorded. The liquid level in the glass bottle is not lower than that of the liquid cylinder, so that the glass bottle cannot float due to the buoyancy of the liquid in the liquid cylinder.

7. The scale difference of the colored liquid in the suction pipe of the same glass bottle component is the expansion and contraction phenomenon of the liquid caused by temperature.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A teaching aid for exploring expansion with heat and contraction with cold of liquid is characterized by comprising a transparent bottle (1), a tubular measuring part (2), a thermometer (3), a cold liquid cylinder (4) and a hot liquid cylinder (5);

the transparent bottle (1) is filled with colored liquid and is respectively placed in the cold liquid cylinder (4) and the hot liquid cylinder (5); scales are arranged on the tubular measuring piece (2) and are inserted into the colored liquid of the transparent bottle (1), and the bottom end of the tubular measuring piece (2) is suspended with the bottom end of the transparent bottle (1); the thermometer (3) is detachably arranged in the cold liquid cylinder (4) and the hot liquid cylinder (5); the cold liquid cylinder (4) and the hot liquid cylinder (5) are respectively filled with cold liquid and hot liquid, and probes of the thermometer (3) are arranged in the cold liquid and the hot liquid.

2. A teaching aid as claimed in claim 1, wherein the mouth of the transparent bottle (1) is fitted with a rubber cap (6), the rubber cap (6) being provided with a perforation into which the tubular measuring element (2) is inserted.

3. The teaching aid of claim 1, further comprising a limiting plate (7) and a thermometer fixing stick (8), wherein the limiting plate (7) is respectively arranged on the bottom walls of the cold liquid cylinder (4) and the hot liquid cylinder (5), the limiting plate (7), the side walls of the cold liquid cylinder (4) and the hot liquid cylinder (5) form a mounting hole (9) for inserting the thermometer fixing stick (8), the thermometer fixing stick (8) is L-shaped, one end of the thermometer fixing stick is inserted into the mounting hole (9), the other end of the thermometer fixing stick is connected with the thermometer (3), and a probe of the thermometer (3) is vertically inserted into the cold liquid and the hot liquid.

4. A teaching aid as claimed in claim 1, wherein the transparent bottle (1) is a glass bottle.

5. A teaching aid as claimed in claim 1, wherein the tubular measuring element (2) is a graduated straw having an internal diameter of 1-2 mm.

6. A teaching aid as claimed in claim 3, characterized in that the thermometer holder stick (8) is made of plastic.

7. A teaching aid as claimed in claim 1, characterized in that the cold liquid cylinder (4) and the hot liquid cylinder (5) are both made of plastic.

8. A teaching aid as claimed in claim 1, wherein the cold liquid tank (4) and the hot liquid tank (5) are each of cuboid chamber construction.

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