CN214410449U

CN214410449U - Specific heat capacity experiment teaching aid for physical teaching

Info

Publication number: CN214410449U
Application number: CN202120287102.1U
Authority: CN
Inventors: 张华�
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-10-15
Anticipated expiration: 2031-02-02

Abstract

The utility model discloses a physics teaching is with specific heat capacity experiment teaching aid, including heat-preserving container, terminal, resistance wire and thermometer. The beneficial effects of the utility model are that, the experiment teaching aid of the utility model has few easy-heating accessories, effectively ensures that the experiment is in the adiabatic process, utilizes two copper wires to replace the metal binding post to connect the heating resistance, adopts the inner container with mercury to coat the small-sized dewar flask, and the bottle cap is tightly sealed by the heat-insulating material, effectively and accurately reduces the defect of excessive heat dissipation of the original device; the utility model discloses a resistance surface that the experiment teaching aid adopted is insulated with winding yarn covering wire, and is more loosely full of whole kerosene space, and kerosene is heated more evenly, need not the stirring rod, has simplified the experiment operation process; the utility model discloses an experiment teaching aid has highlighted the physical process, is favorable to the student to understand the physical phenomenon deeply, makes the operator deepen the understanding of the nature of physical phenomenon and to the understanding of relevant theory, and the experiment to training the student explores the ability and has the significance.

Description

Specific heat capacity experiment teaching aid for physical teaching

Technical Field

This application belongs to the experimental facilities field, and specifically is a physics teaching is with specific heat capacity experiment teaching aid.

Background

The specific heat capacity experiment and the thermal equivalent experiment are important experiments in the middle-school thermal part. However, the existing specific heat capacity experimental device has the following problems: firstly, the whole experiment teaching aid has too many accessories, up to three heat absorption devices, a binding post, an aluminum container and a stirring rod. Secondly, the heat dissipation point of the whole experiment is more. The container of the teaching aid is basically a plastic product, and the sealing property is poor; the requirement that the system is in an adiabatic process in the experimental process is greatly different, so that the system error is large. In addition, the liquid is thermally inert and has a significant potential for counting when the temperature changes rapidly, and the water in the vessel must be continuously stirred. Finally, the current and voltage values in the middle heating process cannot be recorded by the existing teaching aid, so that the current and voltage values are not only stared at the stopwatch and the mercury thermometer for frequently measuring time and temperature, but also the changes of voltage and current are observed; and because the reading of mercury thermometer can only be observed in limited visual angle scope, difficult accomplishing quick reading, be not convenient for the student to understand the experiment principle. Repeated test results show that the relative experimental error of the existing specific heat teaching aid is more than 20% due to the problem of the structure of the teaching aid.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

The utility model discloses a technical problem that needs to solve provides a physics teaching is with specific heat capacity experiment teaching aid, and it is not good to solve current specific heat capacity teaching aid thermal insulation performance, receives external environment's influence easily, and the experimentation is more complicated, needs the frequent measuring time of experimenter and the problem of temperature.

2. Technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: a specific heat capacity experiment teaching aid for physical teaching comprises a heat-preserving container, a binding post, a resistance wire and a thermometer; the heat-preserving container is a Dewar flask with a silver-plated inner container, and a bottle cap is plugged in the bottle mouth; the heat-preserving barrel is filled with kerosene; the two binding posts extend into the bottle cap respectively, and the resistance wire is connected between the bottom ends of the two binding posts; the thermometer probe extends into the heat-preserving barrel from the center of the bottle cap and is positioned between the two binding posts; the top ends of the two binding posts are respectively connected with a power supply to form a loop.

The teaching aid for the specific heat capacity experiment is characterized in that the wiring terminal comprises a thick copper column and a thin copper rod; the thin copper rod extends into the heat-preserving barrel from the bottle cap, and the bottom end of the thin copper rod is connected with the resistance wire; the upper end of the fine copper rod is connected with the coarse copper column; the thick copper column is located the bottle lid top, and is connected with the power.

Above-mentioned specific heat capacity experiment teaching aid, wherein, bottle lid bottom surface along axial extension form with the rubber ring of heat-preserving container inner wall looks adaptation.

Above-mentioned specific heat capacity experiment teaching aid, wherein, the winding has the yarn covering wire outward of resistance wire, just the yarn covering wire is filled in whole kerosene space.

The teaching aid for the specific heat capacity experiment is characterized in that a silica gel sheet is pasted on the bottom surface of the bottle cap.

Above-mentioned specific heat capacity experiment teaching aid, wherein, it has the silica gel stopper to fill between bottle lid and terminal and the thermometer probe.

3. Advantageous effects

To sum up, the beneficial effects of the utility model reside in that:

(1) the utility model discloses an easy hot accessory is few in the experiment teaching aid, effectively guarantees that the experiment is in adiabatic process, has utilized two copper lines to replace metal binding post to connect heating resistor, adopts the inner bag to have mercury to scribble small-size dewar bottle, and the bottle lid is tightly sealed with heat-insulating material, has effectively makeedly lacked the too much drawback of former device heat dissipation.

(2) The utility model discloses a resistance surface that experiment teaching aid adopted is insulated with winding yarn covering line, is full of whole kerosene space looser, and kerosene is heated more evenly, need not the stirring rod, has simplified the experiment operation process.

(3) The utility model discloses an experiment teaching aid has highlighted the physical process, is favorable to the student to understand the physical phenomenon deeply, makes the operator deepen the understanding of the nature of physical phenomenon and to the understanding of relevant theory, and the experiment to training the student explores the ability and has the significance.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure: 1-a heat-preserving barrel; 2-a binding post; 3-resistance wire; 4-a thermometer; 5-bottle cap; 6-coarse copper columns; 7-a thin copper rod; 8-rubber ring; 9-wrapping yarns with yarns; 10-silica gel sheet; 11-silica gel plug.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a specific heat capacity experiment teaching aid for physical teaching comprises a heat-preserving container 1, a binding post 2, a resistance wire 3 and a thermometer 4; the heat-preserving container 1 is a Dewar flask with a silvered inner container, and a bottle cap 5 is plugged at the bottle mouth; the heat-preserving barrel 1 is filled with kerosene; the two binding posts 2 respectively extend into the bottle caps 5, and the resistance wire 3 is connected between the bottom ends of the two binding posts 2; the probe of the thermometer 4 extends into the heat-preserving container 1 from the center of the bottle cap 5, and the probe of the thermometer 4 is positioned between the two binding posts 2; the top ends of the two binding posts 2 are respectively connected with a power supply to form a loop.

The binding post 2 comprises a thick copper column and a thin copper rod 7; the thin copper rod 7 extends into the heat-preserving barrel 1 from the bottle cap 5, and the bottom end of the thin copper rod is connected with the resistance wire 3; the upper end of the thin copper rod 7 is connected with the thick copper column; the thick copper post is located 5 tops of bottle lid, and is connected with the power, utilizes the copper line that electric conductive property is strong to replace the iron terminal, reduces terminal 2 and generates heat and cause the influence to whole experimentation.

The bottom surface of the bottle cap 5 extends axially to form a rubber ring 8 matched with the inner wall of the heat-preserving barrel 1, and a silica gel sheet 10 is pasted on the bottom surface of the bottle cap 5. And a silica gel plug 11 is filled between the bottle cap 5 and the binding post 2 as well as between the probe of the thermometer 4, so that the whole bottle cap 5 is tightly sealed by the rescue material, and the heat loss in the vacuum bottle 1 is effectively reduced.

The resistance wire 3 is wound with the yarn covered wire 9, the yarn covered wire 9 is filled in the whole kerosene space, heat emitted by the resistance wire 3 can be uniformly conducted to the whole kerosene space without stirring, and the process of the whole experiment is simplified.

Example (b):

the experimental device comprises: DISLab system, heat preservation barrel 1(450ml Dewar flask), kerosene 163g, thermometer 4, current voltmeter, storage battery (12V), resistance wire 3 (electric stove wire resistance 10 omega), slide rheostat 10 omega and a plurality of wires. Firstly, the empty Dewar flask and the kerosene added into the empty Dewar flask are weighed by an electronic scale, and the mass of the kerosene is m0 and m1 respectively, so that the mass of the kerosene is 0.163 kg. The experimental teaching aid was then installed in the manner shown in figure 1, with the wires in the dewar and the voltmeter and thermometer connected to the circuit. And a loop consisting of the binding post 2, the resistance wire 3, the slide rheostat and the storage battery is switched on, the thermometer 4 and the current voltmeter are used for respectively collecting voltage, current and temperature data and are connected into a computer, and DISLab software is operated. The P of the sliding varistor scribe was moved to control the loop current at about 0.8A, with the DISLab software collecting the loop current, voltage and lack of stability every 2 seconds, one timed cycle every 100 times. Finally, respectively inputting the specific heat capacity and the mass of the kerosene, and according to a specific heat capacity formula: c is Q/(m Δ T), and experimental results are obtained. The above experimental procedure was repeated by varying the values of resistance and current of the entire circuit by means of a sliding rheostat.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a physics teaching is with specific heat capacity experiment teaching aid which characterized in that: comprises a heat-preserving barrel (1), a binding post (2), a resistance wire (3) and a thermometer (4); the heat-insulating barrel (1) is a Dewar flask with a silvered inner container, and a bottle cap (5) is plugged at the bottle mouth; the heat-preserving barrel (1) is filled with kerosene; the two binding posts (2) respectively extend into the bottle cap (5), and the resistance wire (3) is connected between the bottom ends of the two binding posts (2); the probe of the thermometer (4) extends into the heat-preserving container (1) from the center of the bottle cap (5), and the probe of the thermometer (4) is positioned between the two binding posts (2); the top ends of the two binding posts (2) are respectively connected with a power supply to form a loop.

2. The teaching aid for specific heat capacity experiments for physics teaching of claim 1, characterized in that: the wiring terminal (2) comprises a thick copper column and a thin copper rod (7); the thin copper rod (7) extends into the heat-preserving barrel (1) from the bottle cap (5), and the bottom end of the thin copper rod is connected with the resistance wire (3); the upper end of the thin copper rod (7) is connected with the thick copper column; the blister copper post is located bottle lid (5) top, and is connected with the power.

3. The teaching aid for specific heat capacity experiments for physics teaching of claim 1, characterized in that: the bottom surface of the bottle cap (5) extends along the axial direction to form a rubber ring (8) matched with the inner wall of the heat-preserving barrel (1).

4. The teaching aid for specific heat capacity experiments for physics teaching of claim 1, characterized in that: the resistance wire (3) is wound with a yarn covered wire (9), and the whole kerosene space is filled with the yarn covered wire (9).

5. The teaching aid for specific heat capacity experiments for physics teaching of claim 1, characterized in that: the bottom surface of the bottle cap (5) is pasted with a silica gel sheet (10).

6. The teaching aid of specific heat capacity experiment for physics teaching of claim 5, characterized in that: and a silica gel plug (11) is filled between the bottle cap (5) and the binding post (2) and between the bottle cap and the probe of the thermometer (4).