Device and method for measuring specific heat ratio of air under different temperatures

Abstract

The invention provides a device for measuring specific heat ratio of air under different temperatures, which comprises an air storage bottle, a pressure sensor and an air temperature testing sensor which are arranged in the bottle, wherein an air charge part and an air discharge part are fixed on the air storage bottle. The device is characterized in that the device further comprises a temperature display and control device which is arranged around the air storage bottle. The temperature display and control device comprises a heat bath container, an electric heating part, a bath temperature testing sensor and a microcontroller, wherein the electric heating part and the bath temperature testing sensor are fixedly arranged in the heat bath container and are electrically connected with the microcontroller. The invention further provides a method for measuring the specific heat ratio of the air under different temperatures through above device. The device and the method can ensure that the air temperature can be at a precise range, enriches the experimental teaching contents and improves the learning initiatives of the students.

Description

technical field [0001] The invention belongs to the field of experimental teaching, and relates to a device for measuring specific heat capacity ratio of air, in particular to a device for measuring specific heat capacity ratio of air at different temperatures, and a method for measuring air specific heat capacity ratio at different temperatures using the device. Background technique [0002] Usually, the same substance can have different specific heat capacities, and the specific heat capacity of a substance not only has a strong dependence on temperature, but also depends on the constraints imposed on the substance itself by the outside world. When the pressure is constant, the specific heat capacity of the substance at constant pressure C P , when the volume is constant, the specific specific heat capacity C of the substance can be obtained V . Specific heat capacity of gas at constant pressure C P With specific volume heat capacity C V The ratio is called the specifi...

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Problems solved by technology

[0003] In the process of directing the experiment of "Measurement of Air Specific Heat Capacity Ratio", it was found that the existing device for measuring the specific heat capacity ratio of air used in this experiment has the following deficiencies: First, the air specific heat capacity ratio measured by the device is only within a certain period of time. The gas specific heat ratio is a physical quantity that changes with the gas temperature, and this experimental equipment cannot reflect this physical phenomenon; second, the whole process of this experiment lasts more than 3 hours, and the room temperature during the period is due to various reasons. Constantly changing, that is, it is impossible to ensure that the room temperature is maintained at a certain fixed temperature, and the specific heat capacity ratio of the air at a certain temperature cannot be obtained exactly; the third is that the gas in the gas storage cylinder in the existing equipment of this experiment is in a sealed state, and the temperature in the cylinder The balance process with the temperature outside the bottle is relatively long, and the reading must wait until the gas state in the bottle is completely stable, which reduces the learning efficiency of students

The above deficiencies have weakened the teaching effect that the experiment should have achieved, and it is also one of the focus issues that students have reflected on this experiment. If the above deficiencies can be overcome, it will not only enrich the teaching content of this experiment, but also improve students' understanding of this experiment. Enthusiasm to ensure teaching effect

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