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The temperature determines the humidity.
Your question is a little unclear. The devices used to record temperature and relative humidity are "thermometers (temperature)." and "hygrometers (relative humidity)". Sorry if this isn't what you were looking for.
30 to 50% of Relative humidity - the relative part of relative humidity being relative to the temperature.
Either dehumidify (remove water vapour), rehumidify (add water vapour) - both at constant temperature, or raise temperature (which will lower relative humidity), or lower temperature (which will raise relative humidity).
If the absolute humidity remains constant while the temperature rises, the relative humidity will decrease (and vice versa). This is because the air's capacity to hold water increases as the temperature increases so the constant amount of water represents a smaller and smaller percentage of the maximum amount the air can hold. A: As air temperature goes up, the maximum amount of water vapor that it can hold goes up. Thus if the water content stays constant, the the humidity goes down. If the humidity stays constant, then the water vapor content goes up.
Cold air cannot hold as much water vapor as warm air. As temperature drops relative humidity rises. Absolute humidity remains constant until the dewpoint temperature is reached, then decreases with temperature as water precipitates out of the air. Below the dewpoint temperature relative humidity remains constant at 100%.
Temperature is relative to the humidity of the surrounding.
The temperature determines the humidity.
relative humidity is the amount of moisture that air can hold in a certain temperature
Your question is a little unclear. The devices used to record temperature and relative humidity are "thermometers (temperature)." and "hygrometers (relative humidity)". Sorry if this isn't what you were looking for.
relative humidity
30 to 50% of Relative humidity - the relative part of relative humidity being relative to the temperature.
The relative humidity decreases
Either dehumidify (remove water vapour), rehumidify (add water vapour) - both at constant temperature, or raise temperature (which will lower relative humidity), or lower temperature (which will raise relative humidity).
The relative humidity will decrease
That would be "dewpoint"...When the air temperature falls to the dewpoint (or dewpoint rises to the air temperature), then you have 100% relative humidity.
Moisture and temperature.