Empty box barometer works

PV=NRT
P pressure
V volume
NR constant
T temperature This material contains a metal empty box with a certain volume of gas. According to the formula, the temperature is constant. The larger the air pressure, the larger the volume is. The expansion of the box uses the principle of lever to transmit the force to the dial. The change of the empty box is flat. The metal diaphragm is composed of an empty box group, and the air pressure inside the box is low. Using the principle of the equilibrium of elastic stress and atmospheric pressure, the air pressure is measured by the displacement of its deformation. The advantage is that it is easy to carry and install. However, since the elastic coefficient of the metal diaphragm changes with temperature, temperature compensation measures must be taken; the deformation of the empty box has elastic lag, and within a certain pressure range, the deformation curves of boosting and depressurizing do not coincide. The above two factors make the measurement accuracy of the empty box barometer lower than the mercury barometer. The empty box barometer is made using the principle of an empty box barometer, which is a barometer that can be automatically recorded.
An aneroid barometer is a type of barometer. Its main part is a vacuum metal box with a corrugated surface. In order not to flatten the metal case by atmospheric pressure, it is pulled outward with an elastic steel sheet. As the atmospheric pressure increases, the lid is recessed; the atmospheric pressure is reduced and the elastic steel sheet pulls the lid up. The change of the cover is transmitted to the pointer through the transmission mechanism to deflect the pointer. From the reading on the dial below the pointer, you can know the value of the atmospheric pressure at that time. It is easy to use and easy to carry, but the measurement results are not accurate enough. If the indicator on the dial of the liquid-free barometer is not the value of atmospheric pressure, but the height, it becomes an altimeter for aviation and mountaineering.

The temperature on sunny days is high, and the movement of gas molecules is higher than that on cloudy days. In the same volume, the more intense the movement of gas molecules, the higher the pressure.

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