CN204495678U - A kind of self-control simple liquid density claims - Google Patents

Abstract

The utility model discloses a kind of self-control simple liquid density to claim, comprise wooden stick, groove, iron block, sliding weight of steelyard, sliding weight of steelyard line, lancet and sliding weight of steelyard line, thicker one end, described wooden stick one end is thinner, the thicker one end of described wooden stick is provided with groove, described iron block is fixed in groove by described sliding weight of steelyard line, described lancet is fixed on the centre of gravity place of described wooden stick, and described sliding weight of steelyard is connected with described wooden stick by described sliding weight of steelyard line.The utility model has to draw materials and is easy to get, makes the advantages such as simple, easy to operate, principle is understandable, and student does it yourself to make and student can be excited the interest of Physics Learning, has positive effect to the creativity consciousness of training student and innovation ability.

Description

A kind of self-control simple liquid density claims

Technical field

The utility model relates to a kind of density measure field, and especially a kind of self-control simple liquid density claims.

Background technology

Density is a kind of important physical characteristics of material, not with shape and spatial geographical locations change and change, but with the state of material, temperature, pressure change and change, density relevant knowledge occupies very important position in physics teaching in secondary school.At present, the measuring method of fluid density has conventional method, density bottle method, buoyancy method etc., and conventional fluid density is in respect of float type densimeter, static pressure type densitometer, vibrating densimeter and radioisotope densimeter.

Summary of the invention

The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, provides the simple and easy density of a kind of self-control to claim, and it has to draw materials and is easy to get, makes the features such as simple, easy to operate, principle is understandable.

For achieving the above object, the utility model adopts following technical proposals:

A kind of self-control simple liquid density claims, comprise wooden stick, groove, iron block, sliding weight of steelyard, sliding weight of steelyard line, lancet and sliding weight of steelyard line, thicker one end, described wooden stick one end is thinner, the thicker one end of described wooden stick is provided with groove, described iron block is fixed in groove by described sliding weight of steelyard line, described lancet is fixed on the centre of gravity place of described wooden stick, and described sliding weight of steelyard is connected with described wooden stick by described sliding weight of steelyard line.

Described sliding weight of steelyard moves left and right on described wooden stick by described sliding weight of steelyard line.

Aperture is bored, the fixing thread described lancet of described sliding weight of steelyard at described wooden stick center of gravity place.

Described wooden stick smooth surface.

After student finishes the knowledge such as buoyancy, lever equilibrium condition relevant in physics, only need be immersed in testing liquid by the iron block of this scale when measuring liquid, mobile sliding weight of steelyard, makes scale be in equilibrium state, directly can read the density value of this kind of liquid from scale thick stick.

The beneficial effects of the utility model are,

(1) draw materials easily, make simple, originates from life is used for life, classroom experiment is designed to home test, easily available article are used to carry out inquiry activity at one's side, furthered the distance of physics and life, make student experience the authenticity of science, experience the relation of science and society, science and daily life;

(2) easy to operate, can repeatedly use, be applicable to student experimenting;

(3) producing principle with learn physical knowledge and combine closely, be convenient to student's understand and master, student can also be given full play to the interest of scientific exploration, enthusiasm and novelty, make full use of that laboratory allows student starting, opens one's mouth, pinpoint the problems in the inquiry activity that beats one's brains, deal with problems.

Accompanying drawing explanation

Fig. 1 is the utility model structural representation;

Fig. 2 is that the utility model fluid density measures schematic diagram.

Wherein 1, wooden stick, 2, lancet, 3, iron block, 4, sliding weight of steelyard, 5, sliding weight of steelyard line, 6, groove.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further illustrated.

A kind of self-control simple liquid density claims, as shown in Figure 1, comprise wooden stick 1, groove 6, iron block 3, sliding weight of steelyard 4, sliding weight of steelyard line 5 and lancet 2, thicker one end, wooden stick 1 one end is thinner, the thicker one end of wooden stick 1 is provided with groove 6, iron block 3 is fixed in groove 6 by sliding weight of steelyard line 5, and lancet 2 is fixed on the centre of gravity place of wooden stick 1, and sliding weight of steelyard 4 is connected with wooden stick 1 by sliding weight of steelyard line 5.

Sliding weight of steelyard 4 moves left and right on wooden stick 1 by sliding weight of steelyard line 5; Aperture is bored, the lancet 2 that fixing sliding weight of steelyard line 5 is made at wooden stick 1 center of gravity place.

Operating process is as follows:

1, find out wooden stick 1 center of gravity O with pivot point technique, and centre of gravity place fixed installation on lancet 2; Then wooden stick 1 comparatively butt end B place (groove 6) fasten a fixing iron block G ₀(volume that drainage determines iron block is V ₀), mention lancet 2, mobile sliding weight of steelyard G ₁, make it in horizontal level balance, then measure the distance d of sliding weight of steelyard line A to lancet point O with rule _oA, obtain G according to lever equilibrium condition ₀d _oB=G ₁d _oB, i.e. ρ _ironv ₀g d _oB=G ₁d _oA, 1.

2, when iron block 3 is immersed in certain liquid ρ _liquidtime middle, portable lancet 2, mobile sliding weight of steelyard line 5, if when moving on to C point (as shown in Figure 2) arm beam of steelyard balance, now have (G ₀-F _floating) d _oB=G ₁d _oC,

I.e. (ρ _ironv ₀g-ρ _liquidv ₀g) d _oB=G ₁d _oC, 2.

By 1., 2. formula can obtain ρ _liquid=[(d _oA-d _oC)/d _oA] ρ _iron=(d _aC/ d _oA) ρ _iron, 3.

Work as ρ _liquid(when iron block 3 is put and weighed in atmosphere, be similar to and think that the density of air is zero) when=0, d _aC=0, therefore engrave " 0 " scale mark at A point.

Work as ρ _liquid=1.0 × 10 ³kg/m ³time (when iron block 3 is immersed in and weighs in water), d _aC1=(1/7.8) d _oA, namely measure (1/7.8) d left from A point _oAthe long C determined ₁point place engraves " 1.0 × 10 ³" or " 1.0 " printed words.

In like manner, d is measured left from A _aC2=(2/7.8) × d _oAthe long C determined ₂point place engraves " 2.0 " printed words.The rest may be inferred by analogy for it, can carve " 3.0 ", " 4.0 " .....Using the same method, it is less also scale etc. can be got, as " 0.1,0.2 ..., 7.8 ", like this, the order of accuarcy of reading during use, can be improved.

This liquid density balance can only be used for surveying density and be less than or equal to ρ _iron=7.8 × 10 ³kg/m ³fluid density value.As will the fluid densities such as mercury be surveyed, then when making this scale, density value can be used instead and compare ρ _mercurylarge metal (as platinum etc.) uses the same method again " nail scale ".

By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.

Claims (1)

1. a self-control simple liquid density claims, comprise wooden stick, groove, iron block, sliding weight of steelyard, sliding weight of steelyard line, lancet and sliding weight of steelyard line, it is characterized in that, thicker one end, described wooden stick one end is thinner, the thicker one end of described wooden stick is provided with groove, described iron block is fixed in groove by described sliding weight of steelyard line, and described lancet is fixed on the centre of gravity place of described wooden stick, and described sliding weight of steelyard is connected with described wooden stick by described sliding weight of steelyard line;

Described sliding weight of steelyard moves left and right on described wooden stick by described sliding weight of steelyard line;

Aperture is bored, the fixing thread described lancet of described sliding weight of steelyard at described wooden stick center of gravity place;

Described wooden stick smooth surface.