Humidity indicator

Humidity and hygrometry
Specific concepts
	Absolute / Specific / Relative; Dew point (depression); Psychrometrics;
General concepts
	Air; Concentration; Density; Dew; Evaporation; Humidity buffering(Atm.) Pressure; Liquid water; Avogadro's law; Nucleation; Thermodynamic equilibrium;
Measures and Instruments
	Heat index; Sat. vap. density; Mixing ratio; Water activity; H. indicator card; ; Hygrometer; Dry/Wet-bulb temperature;

A humidity indicator is a moisture-sensitive chemical that changes color when the indicated relative humidity is exceeded.

Chemicals

Some chemicals are:

Humidity indicator on the lithium-ion battery of an mobile phone
top: before wetting
bottom: after wetting
(batery model: Samsung AB653039)

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Humidity and hygrometry

Specific concepts
Absolute / Specific / Relative Dew point (depression) Psychrometrics
General concepts
Air Concentration Density Dew Evaporation Humidity buffering (Atm.) Pressure Liquid water Avogadro's law Nucleation Thermodynamic equilibrium
Measures and Instruments
Heat index Sat. vap. density Mixing ratio Water activity H. indicator card Hygrometer Dry/Wet-bulb temperature