Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Which of the following phenomena is the reason behind wearing cotton clothes in summer?
Sublimation
Condensation
Evaporation
Fusion
Evaporation
Cotton clothes are preferred in summer because they are good absorbers of water. They absorb the sweat from our body and expose it to the atmosphere, facilitating its evaporation.
Cotton clothes are preferred in summer because they are good absorbers of water. They absorb the sweat from our body and expose it to the atmosphere, facilitating its evaporation.
Think of it like an air-conditioner: sweat is the heat waste, and cotton acts as the wick that spreads the moisture, allowing the wind to 'carry away' the heat through rapid evaporation.
ACE: Absorb, Cool, Evaporate.
Q=m├ЧLvтАЛ тАФ where Q is heat energy absorbed, m is mass of sweat, and LvтАЛ is latent heat of vaporization.
The principle behind this is evaporation, which is an endothermic process. During evaporation, the particles at the surface of the liquid gain energy from the surroundings (in this case, our body) to overcome the forces of attraction and turn into vapor. This process removes heat from our body, thereby causing a cooling effect.
Cotton is a natural, hydrophilic fiber.
Evaporation requires latent heat, which is sourced from the skin surface.
Synthetic clothes (polyester/nylon) are hydrophobic and do not absorb sweat, trapping heat against the body.
Promotes air circulation due to fiber breathability
Hypoallergenic and gentle on skin
High moisture-wicking capacity
Summer apparel
Bed linens in warm climates
Medical bandages (for absorbing discharge)
Sublimation is the direct transition of a solid to a gas (e.g., dry ice).
Condensation is the process of a gas turning into a liquid (e.g., water droplets on a cold glass).
Fusion is the phase transition from solid to liquid (melting).
Option C is the correct physical phenomenon responsible for cooling.
C is correct тАФ Evaporation causes heat loss from the body, providing a cooling effect in hot weather.
Remember that any process involving a change of state from liquid to gas requires energy input (latent heat), which leads to cooling in the surrounding environment.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants