Hygrometer
how much water vapor can a cubic meter of air hold at 25 centigrades grades?
A volt meter
A wattmeter measures power, which is the rate of doing work, expressed in watts.An energy meter measures the amount of energy consumed, usually in kilowatt hours.The meter on the wall of your house is an energy meter.
relative humidity
There is no fixed relative humidity by temperature. There is an absolute maximum, determined by temperature and pressure. At 25 degrees C, air can hold about 23.04 grams of water per cubic meter (g/m3) At 28 degrees C, air can hold about 27.4 grams of water per cubic meter (g/m3). This is about 19.3% more water vapor. *This is based on standard atmospheric pressure. Denser air hold more, thinner air holds less.
There are lots of humidity meters on Amazon.com. Last year, I bough a nice thermometer / humidity meter for less than ten dollars. You can probably still find it on Amazon.
Humidity meters are used to measure the humidity outside. Typically, these would be placed on the outside of your house to accurately measure the humidity.
humidity meter
Because it doesn't say neither the temperature, the pressure or the humidity of the air. You need to know both the temperature, the pressure and the humidity of the air to say anything about the mass of one cubic meter of air.
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Humidity is dampness in the air. The intrument that measures it is a hygrometer, and a day with low humidity is more comfortable because its easier to breath
Humidity
dying machinery ,
www.InstrumentsDirect.com do provide this facility in houston. they offer to Rent & Buy Ultrasonic Flow Meters. they Also includes electronic measurement & test equipment, flow meter, humidity meter
The amount of water vapor in the air is called the absolute humidity. It is usually expressed as grams of water vapor per cubic meter of air.