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Image result for humidity "Its not the heat. Its the Humidity" People says this because

Humidity , which is the amount of water vapor in the air, can make hot temperatures even more unbearable than they already are.

Humidity plays an important role in both weather and climate on earth . It makes our planet hospitable for us! Water vapour is a key greenhouse gas, which helps block harmful UV rays from the sun as well as traps heat on Earth that makes life possible.

Humidity is probably the second most common weather measurement. It affects our comfort, how much water we give our lawns, and how fast water evaporates. It determines how effective evaporate coolers will work.

When weather folks talk about humidity, what they are really talking about is relative humidity and sometimes also as absolute humidity.

Relative Humidity (RH) is the amount of water vapor in the air relative to what the air can hold. It is expressed as % RH. Lets understand it in a easy way:  if you have a cup that is half-full of water, the cup contains 50% of what it can hold. Air works the same way.
Let's say that a certain parcel of air can hold 60 grams of water vapor per cubic meter of air, but it only has 30 grams of water vapor per cubic meter of air. We simply divide the amount of water present by the amount of water possible, so 30 divided by 60, and then multiply it by 100 to get a percent. So in this case, 30 / 60 = 0.5, multiplied by 100 gives us 50%. So the relative humidity is 50%, which means the air contains about half of the total water vapor it could possibly hold.

Why is it “relative?” It turns out that the warmer the air, the more water it can hold. And vice versa; as it cools, it can’t hold as much water. Therefore, RH is relative to temperature.
Absolute Humidity is the amount of water vapour divided by the amount of dry air in a certain volume of air at a particular temperature.

Humidity measurement devices are also called hygrometers. 

So, lets develop our own device to measure Humidity.
License:[Source ] Jan. 24, 2019, 6:17 p.m.