Hi Sir: I think the absolute humidity is not constant although it is in jar and No water vapour can get in or out. In a confined space, internal humidity is affected by temperature, for example, when the temperature is relatively low, the internal humidity (dew point) drops after the saturated water condenses。 Acturally according to your sensor data we know the temperature data in jar is changed, so it influences the relative humidity and the absolute humidity and the absolute humdity with the temperature change is not constant.
... View more