Question

Chemicals like calcium chloride, silica gel and activated alumina are commonly used for the psychrometric process of:

• A. Humidification
• B. Sensible cooling
• C. Dehumidification
• D. Sensible heating

Hint:

Desiccants like silica gel = absorb moisture → dehumidify the air!

Answer 1

The Correct Option is C

Dehumidification is the process of removing moisture from the air to reduce humidity levels.
Chemicals like calcium chloride, silica gel, and activated alumina are known as desiccants.
They absorb moisture from the air and are widely used in dehumidifiers.
This helps keep indoor air dry and prevents mold, corrosion, and moisture damage.
Humidification is the opposite — adding moisture.
Sensible cooling and heating change air temperature but do not directly remove or add moisture using chemicals.
Therefore, these chemicals are used for dehumidification.