How is the humidtiy measurement determined?

Answer 1

The amount of water vapour that can be contained in the air without condensing into liquid water depends on the temperature of the air.
Warm air can hold more water vapour. Cold air is dry. (That's why it gets stinkin' hot and humid in the summer but the winter is cold and dry....)
Relative humidity is the percentage of water vapour in the air relative to a completely saturated atmosphere at the same temperature.
100% humidity means that the air cannot hold any more water vapour without the vapour condensing into liquid.
60% humidity means that the air only holds 60% of the total amount of water it can hold.
If you took that 60% humidity air and heated it, the humidy level would DROP (50%...40%....30%...) as the temperature increased because the total amount of water in the air stayed the same, but marmer air could potentiall hold more water, so instead of being 60% "full", the air is less "full".
Or, if you cooled the air, the humidity would INCREASE from 60% because cooler air can hold less water vapour.
This is why you get fog on a clear and cool night, especially in high humidity. On a clear night the ground cools off very rapidly which cools the air around it, reducing the temperature which increases the relative humidity of the air. Eventually it hits 100% and you start to get water droplets condensing out of the air....FOG.

Answer 2

There are various devices used to measure and regulate humidity. A device used to measure humidity is called a psychrometer or hygrometer. A humidistat is used to regulate the humidity of a building with a de-humidifier. These can be analogous to a thermometer and thermostat for temperature control.

Humidity is also measured on a global scale using remotely placed satellites. These satellites are able to detect the concentration of water in the troposphere at altitudes between 4 and 12 kilometers. Satellites that can measure water vapor have sensors that are sensitive to infrared radiation. Water vapor specifically absorbs and re-radiates radiation in this spectral band. Satellite water vapor imagery plays an important role in monitoring climate conditions (like the formation of thunderstorms) and in the development of future weather forecasts.

Answer 3

If you know the dry bulb temperature and wet bulb temperature of a particular place you can calculate the dew point and thereby humidity.Some sensors which can respond to humidity variations and which are connected to an electrical or elctronic circuits can give humidity values.This is how the humidity is measured at different altitudes with the help of balloons.Water vapour pictures of weather satellites can estimate the humidity content over a place using the property of absortion of radiation by water vapour.

Answer 4

It is done using this device called 'hydrometer'.

Answer 5

with humidity meter dear.
lol!!!!!!!!!!!!!!!!!!!!!!!!!!!!