A demonstration device for popping up the cork of a thermos

Abstract

According to the invention, an apparatus for demonstrating bounce of a bottle stopper of a thermos bottle is designed to demonstrate the principle of the bounce of the bottle stopper of the thermos bottle. The technical scheme is as follows: the apparatus comprises a container, and a sealing plug is disposed on the top of the container; the apparatus is characterized in that three or more than three temperature sensors are disposed at equal intervals inside the container in a vertical direction, probes of the temperature sensors form a vertical straight line in the vertical direction, the bottom temperature sensor is in contact with the bottom of the container, and the probes of the rest temperature sensors are hung in the air without contacting the inner wall of the container; and at least one pressure sensor is arranged in the container and placed on the upper portion of the container. The beneficial effects of the apparatus are that the knowledge about physics can be popularized to make children know the reason why the bottle stopper bounces, so children can self-consciously avoid possible damage and risk brought by bounce of the bottle stopper and will not watch from above the bottle stopper to hurt the eyes; and the apparatus facilitates improvements in the bottle stopper.

Description

technical field [0001] The present invention relates to an educational or demonstration appliance, especially a demonstration device of physics principles. Background technique [0002] For boiling water bottles, open the cork, pour out a part of the water in the bottle, the part of the space is filled with air, because the bottle mouth is in contact with the external air to dissipate heat, the temperature of the bottle mouth decreases, and the temperature of the air in the bottle and the position where the hot water is in contact with the heat The temperature of the water remains consistent (the same temperature), and the air in the bottle forms a temperature gradient, from the high temperature of the hot water surface to the low temperature of the bottle mouth. Due to the large heat capacity of hot water (the temperature of 1 gram of water at an atmospheric pressure increases or decreases by 1 degree Celsius, the heat change of 1 cal = 4.2 joules), among common substances,...

AI Technical Summary

Problems solved by technology

Due to the large heat capacity of hot water (the temperature of 1 gram of water at an atmospheric pressure increases or decreases by 1 degree Celsius, the heat change of 1 cal = 4.2 joules), among common substances, water has the largest heat capacity, when the bottle is plugged again , the hot water heats the air in the bottle to keep the temperature consistent (because the heat capacity of the air is very small, the heat of the hot water can be ignored as the air temperature rises, and the air temperature is equal to the temperature of the hot water), the temperature difference of the air in the bottle leads to the temperature difference in the bottle The air flow makes the heating process faster, and the temperature of the air in the bottle sealed by the cork rises, resulting in an increase in pressure. The pressure acting on the cork is greater than the friction between the cork and the bottle mouth, and the cork will pop out. There is a large impact force, which may cause personal injury or knock over objects

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