What’s in a Collection? Hygrometers
What is a Hygrometer? First documented in the late 1700s, the Hygrometer was invented to measure the amount of water vapor in the atmosphere caused by condensation and evaporation better known as humidity. There are two types of humidity: absolute and relative. Absolute humidity tells us how much water vapor is in the atmosphere and how close we are to the saturation point. While relative humidity tells us an approximation of how much water vapor [...]