Changes in atmospheric pressure on rainy days
Thread Content
It has rained lightly for two consecutive days, and the temperature dropped at night; the pressure in a tank with slight positive pressure decreased from 0.8 KPA to negative values. Is this due to a problem with the transmitter or changes in atmospheric pressure?
This post was last edited by ylb913 on 2016-10-24 21:13. It is caused by changes in temperature, and this is a common issue with atmospheric pressure storage tanks. There is a gas phase space above the tank; for ideal gases, this follows the state equation PV=nRT. Even for non-ideal gases, pressure increases as temperature rises and decreases as temperature falls.
The conditions on rainy days are not clear; however, the atmospheric pressure is higher in cold weather and lower in hot weather. In winter, the atmospheric pressure is about 3 kilopascals higher than in summer.
It is mainly caused by a decrease in the temperature inside the tank
It mainly depends on what medium is inside the tank
The micro-negative pressure containers in our area will move rapidly in the negative direction during heavy rain