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

File:Humidity indicator before & after wetting.jpg

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

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

Some chemicals are:

• cobalt(II) chloride (toxic) (blue to pink)
• copper(II) chloride (toxic) (yellow to blue)

See also

• Moisture analysis
• Humidity indicator card
• Desiccant

External links

• Chemical Sensitive