CN103839461A - Device for demonstrating internal energy changes during gas working - Google Patents
Device for demonstrating internal energy changes during gas working Download PDFInfo
- Publication number
- CN103839461A CN103839461A CN201210482004.9A CN201210482004A CN103839461A CN 103839461 A CN103839461 A CN 103839461A CN 201210482004 A CN201210482004 A CN 201210482004A CN 103839461 A CN103839461 A CN 103839461A
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- glass cylinder
- syringe
- air
- internal energy
- soft plug
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- Medical Preparation Storing Or Oral Administration Devices (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Abstract
A device for demonstrating internal energy changes during gas working comprises a transparent container. The device is characterized in that the transparent container is a thickened glass cylinder, the lower end of which is fixed on a pedestal; the upper end of the glass cylinder is opened and is equipped with a first soft plug; a side wall of the upper end of the glass cylinder is provided with a side wall hole and a second soft plug; and a syringe needle is inserted into the second soft plug. A proper amount of water or alcohol is added into the glass cylinder. A piston of a syringe is pushed so that air is added into the glass cylinder. When the piston is pushed to a certain extent, it can be observed that the piston jumps out upwards, and "white mist" can be observed. The beneficial effects are that the small-size glass cylinder is used, with little internal air, and thus pressurization is quick, so that an air gun can be replaced with the syringe and the aerating process is visualized; and a wall of the glass cylinder is thick and can bear a large air pressure, so that the first soft plug is pressed very tight, and the generated "white mist" is very obvious.
Description
Technical field
The present invention relates to a kind of junior physics teaching aid, particularly demonstrator for change of internal energy of air doing work.
Background technology
In existing junior middle school physics teaching, many students are to " gas externally does work, interiorly can reduce, temperature reduce " indigestion.Teacher's demenstration method is: in flask, add water, degree of tightness moderately covers cork, with air gun to flask aerating, when air pressure increases to a timing, cork is outwards jumped out, and illustrates that gas internal energy is converted into the mechanical energy of cork, gas internal energy reduces, temperature reduces, and it is countless droplets that near air bottleneck is met cold " liquefaction ", occurs one " white mist ".
The shortcoming of this experiment is: need fix flask with iron stand, stability is bad, and it is careful that operation needs, and uses trouble; " the white mist " that gas produces while reduction because of the temperature of externally doing work only existence in a flash, is difficult to observe, and effect is bad; Flask inner chamber is too large, and air is many, and the air gun aerating time is longer, has influence on the patience of observation of students; Flask walls is thinner, and cork is filled in tightlier at bottle mouth position a little, has the danger of flask explosion, and Ruo Sai get Song is a little, and experimental phenomena is not obvious, does not observe " white mist ".
Summary of the invention
The object of the invention is: for addressing the above problem, provide a kind of demonstrator for change of internal energy of air doing work of easy to use, successful.
The technical solution adopted in the present invention is: a kind of demonstrator for change of internal energy of air doing work, comprise transparent vessel, it is characterized in that: described transparent vessel is thickening type glass infuser, the lower end of described glass infuser is fixed on base, the upper end open of described glass infuser is also furnished with the first cork, the sidewall of described glass infuser upper end has areole and is separately furnished with the second cork, is plugged with the syringe needle of syringe in described the second cork.
Adopt after said structure, in glass infuser, pack appropriate volatile liquid (as water, alcohol etc.) into, be advisable lower than areole with liquid level, cover the first cork and suitably compress; With the syringe needle of syringe, through the second cork, the piston of pushing syringe is to aerating in glass infuser, in the time shifting onto to a certain degree, can see that piston upwards jumps out, and observes " white mist ".
The invention has the beneficial effects as follows: adopt the glass infuser of miniaturization, internal gas is few, pressurization is fast, can change air gun into syringe, the imagery of aerating process; Glass barrel is thicker, can bear compared with atmospheric pressure, and the first cork can be pressed tightlyer, and " the white mist " of generation is very obvious.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
In figure: 1 base, 2 volatile liquids, 3 glass infusers, 4 first corks, 5 areoles, 6 second corks, 7 syringes.
Embodiment
As shown in Figure 1, a kind of demonstrator for change of internal energy of air doing work, comprise transparent vessel, it is characterized in that: described transparent vessel is thickening type glass infuser 3, the lower end of described glass infuser 3 is fixed on base 1, the upper end open of described glass infuser 3 is also furnished with the first cork 4, and the sidewall of described glass infuser upper end has areole 5 and is separately furnished with the second cork 6, is plugged with the syringe needle of syringe 7 in described the second cork 6.
Claims (1)
1. a demonstrator for change of internal energy of air doing work, comprise transparent vessel, it is characterized in that: described transparent vessel is thickening type glass infuser, the lower end of described glass infuser is fixed on base, the upper end open of described glass infuser is also furnished with the first cork, the sidewall of described glass infuser upper end has areole and is separately furnished with the second cork, is plugged with the syringe needle of syringe in described the second cork.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210482004.9A CN103839461A (en) | 2012-11-25 | 2012-11-25 | Device for demonstrating internal energy changes during gas working |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210482004.9A CN103839461A (en) | 2012-11-25 | 2012-11-25 | Device for demonstrating internal energy changes during gas working |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103839461A true CN103839461A (en) | 2014-06-04 |
Family
ID=50802914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210482004.9A Pending CN103839461A (en) | 2012-11-25 | 2012-11-25 | Device for demonstrating internal energy changes during gas working |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103839461A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105608963A (en) * | 2015-12-31 | 2016-05-25 | 融水苗族自治县教育局 | Laboratory instrument for internal energy reduction |
| CN113035029A (en) * | 2021-03-24 | 2021-06-25 | 李军志 | Manufacturing method and using method of vaporization and liquefaction demonstrator |
-
2012
- 2012-11-25 CN CN201210482004.9A patent/CN103839461A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105608963A (en) * | 2015-12-31 | 2016-05-25 | 融水苗族自治县教育局 | Laboratory instrument for internal energy reduction |
| CN113035029A (en) * | 2021-03-24 | 2021-06-25 | 李军志 | Manufacturing method and using method of vaporization and liquefaction demonstrator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140604 |