Demonstration instrument for changing internal energy of object by doing work

Abstract

The utility model relates to a demonstration instrument for changing internal energy of an object by doing work, which comprises a pressure type watering can, a thermometer, a hose and a needle cylinder, the thermometer is arranged on the wall of the pressure type watering can, one end of the hose is communicated with an outlet of the pressure type watering can, and the other end is communicated with an outlet of the needle cylinder. The utility model has the following four advantages: 1, experiment materials can be obtained from life, the cost is low, the operation is simple, and students can finish the experiment at home; secondly, a qualitative experiment is improved into a quantitative experiment, and fuzzy temperature change in the original experiment is quantified into visual and dynamic data through a thermometer; 3, a pressure type water spraying pot is adopted, so that the pressure type water spraying pot has the advantages of falling resistance, pressure resistance and difficulty in bursting, labor is saved when air is pumped into the pot, and the speed of discharging the air is controllable and safer when the experiment of demonstrating external work of the air is carried out; and 4, two experiments of'compressed gas acting 'and'gas external acting' in teaching materials are combined into a whole and are completed through one device, so that the utilization rate of experimental equipment is improved.

Description

Technical Field

[0001] This utility model belongs to the field of teaching equipment technology, and specifically relates to a demonstration device for changing the internal energy of an object by doing work. Background Technology

[0002] In teaching, it is necessary to demonstrate the changes in internal energy when "compressing gas to do work" and "gas doing work on its surroundings". In the original experiment, the change in temperature was rather vague, making it difficult for students to intuitively understand this dynamic process. Moreover, the equipment used in the experiment was difficult to obtain, making it impossible for students to reproduce the experiment, which was not conducive to the development of students' thinking. Utility Model Content

[0003] In view of this, the purpose of this utility model is to address the shortcomings of the existing technology by providing a demonstration device for changing the internal energy of an object by doing work, which combines the two experiments in the textbook, "work done by compressed gas" and "work done by gas on the outside", into one device, and quantifies the vague temperature changes in the original experiment into intuitive and dynamic data.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The device for demonstrating how work changes the internal energy of an object includes a pressure sprayer, a thermometer, a hose, and a syringe. The thermometer is mounted on the wall of the pressure sprayer, and one end of the hose is connected to the outlet of the pressure sprayer, while the other end is connected to the outlet of the syringe.

[0006] To better realize this utility model, the above structure is further optimized by providing an air pump handle on the pressure spray bottle.

[0007] To better realize this utility model, the above structure is further optimized, and the pressure spray bottle is made of polyethylene material.

[0008] To better realize this utility model, the above structure is further optimized, and the thermometer is a digital display thermometer.

[0009] To better realize this utility model, the above structure is further optimized by using a strap to securely connect the hose to the outlet of the pressure sprayer.

[0010] To better realize this utility model, the above structure is further optimized by using a strap to securely connect the outlet of the tubing and the syringe.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] The work-changing internal energy demonstrator provided by this utility model has the following four advantages: First, it can obtain experimental materials from daily life, is low in cost, simple to operate, and students can complete it at home; Second, it improves the qualitative experiment into a quantitative experiment, quantifying the vague temperature changes in the original experiment into intuitive and dynamic data through a thermometer; Third, it uses a pressure-type spray bottle, which has the advantages of being drop-resistant, pressure-resistant, and not easily bursting, and it is relatively easy to pump air into the bottle. When demonstrating the work done by gas, the speed of gas release is controllable, making it relatively safe; Fourth, it combines the two experiments in the textbook, "work done by compressed gas" and "work done by gas on the outside," into one device, improving the utilization rate of experimental equipment, reducing experimental operation steps, and saving experimental time. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the work-changing internal energy demonstrator provided by this utility model.

[0015] In the picture:

[0016] 1-Pressure spray bottle, 101-Air pump handle, 2-Thermometer, 3-Hose, 4-Syringe. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] like Figure 1 As shown, the work-changing internal energy demonstration device provided in this application includes a pressure-type water sprayer 1, a thermometer 2, a hose 3, and a syringe 4. The pressure-type water sprayer 1 is made of polyethylene, which needs to withstand a certain air pressure during use, making it very suitable for this experiment. It has the advantages of being drop-resistant, pressure-resistant, and not easily bursting. Moreover, the pressure-type water sprayer 1 is equipped with an air pump handle 101. The user-friendly handle design makes it easier to pump air into the bottle. When demonstrating the work done by gas, the speed of gas release is controllable, which is relatively safe.

[0021] Thermometer 2 is set on the wall of the pressure spray bottle 1. Thermometer 2 is a digital display thermometer, which displays more intuitive data. It can quantify the vague temperature changes in the original experiment into intuitive and dynamic data. In this way, when we do work on the gas inside the pressure spray bottle 1 or the gas does work on the outside, we can easily judge the increase or decrease of internal energy by the magnitude of the data.

[0022] One end of the flexible hose 3 is connected to the outlet of the pressure spray bottle 1, and the flexible hose 3 is securely connected to the outlet of the pressure spray bottle 1 with a strap. The other end is connected to the outlet of the syringe 4, and the flexible hose 3 is also securely connected to the outlet of the syringe 4 with a strap. The air pressure inside the pressure spray bottle 1 can be transmitted to the syringe 4 through the flexible hose 3. Under the action of pressure, the piston of the syringe 4 will be pushed out, converting some of the internal energy into the mechanical energy of the piston, indicating that the gas does work on the outside.

[0023] The experimental procedure is as follows:

[0024] First, assemble the device and observe and record the initial temperature of the digital thermometer as 20.4℃. Use the air pump handle 101 to start compressing the gas and observe and record the reading of the digital thermometer as 22.1℃. The temperature rise indicates that work is being done on the gas inside the bottle, and its internal energy increases. Then, press the gas outlet valve switch of the spray bottle and find that the temperature drops rapidly to 20.6℃. At the same time, the piston of the syringe 4 is ejected, indicating that the gas is doing work on the outside, the temperature decreases, the internal energy decreases, and some of the internal energy is converted into the mechanical energy of the piston.

[0025] This application combines the two experiments in the textbook, "Compressing Gas to Do Work" and "Gas Doing Work on the Surface," into one, using a single apparatus. This improves the utilization rate of experimental equipment, reduces experimental steps, and saves experimental time. Furthermore, the experimental materials can be obtained from everyday life, making it low-cost and easy to operate. Students can complete the experiment at home, which helps them to broaden and expand their thinking.

[0026] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A demonstration device for changing the internal energy of an object by doing work, characterized in that: It includes a pressure spray bottle (1), a thermometer (2), a hose (3) and a syringe (4). The thermometer (2) is installed on the wall of the pressure spray bottle (1). One end of the hose (3) is connected to the outlet of the pressure spray bottle (1) and the other end is connected to the outlet of the syringe (4). The pressure spray bottle (1) is equipped with an air pump handle (101).

2. The demonstration device for changing the internal energy of an object by doing work according to claim 1, characterized in that: The pressure spray bottle (1) is made of polyethylene.

3. The demonstration device for changing the internal energy of an object by doing work according to claim 1, characterized in that: The thermometer (2) is a digital display thermometer.

4. The device for demonstrating the change of an object's internal energy through work according to any one of claims 1-3, characterized in that: The hose (3) is fastened to the outlet of the pressure sprayer (1) by a strap.

5. The work-changing internal energy demonstration device according to claim 4, characterized in that: The outlet of the tubing (3) and the syringe (4) are fastened together with a strap.

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