Home › Maharashtra SSC (Class 10) › Physics › Heat › Air at 40 °C can hold 49 g of water vapour per k…
Air at 40 °C can hold 49 g of water vapour per kg of dry air, while at 20 °C it can hold only 14.7 g per kg. What does this illustrate?
AWarmer air can hold more vapour before saturating
BCooler air can hold more vapour before saturating
CTemperature does not affect saturation
DVapour content always stays fixed at 49 g per kg
Answer & Solution
Correct answer: A. Warmer air can hold more vapour before saturating
1. At 40 °C the saturation limit is 49 g/kg; at 20 °C it is only 14.7 g/kg.
2. The higher temperature corresponds to the larger holding capacity.
3. Therefore warmer air can hold more vapour before becoming saturated.
4. The data show capacity falls as temperature drops, so the cooler-air and fixed-value options are rejected.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.75_
Related questions
A calorimeter of mass 100 g (specific heat 0.1 cal/g °C) contains 250 g of liquid at 30 °CTo convert 2 kg of water at 20 °C into ice at 0 °C, liquid ammonia is evaporated. Given spA thermally insulated pot holds 150 g of ice at 0 °C. How much steam at 100 °C must be add80 g of steam at 97 °C is released onto an ice slab at 0 °C. Using L(vap) = 540 cal/g, speA copper sphere of mass 100 g at 100 °C is dropped into 195 g of water at 20 °C held in a Going by the calorie definition, the heat needed to raise the temperature of 1 kg of waterIn Hope's apparatus, when water is cooled by the freezing mixture, the lower thermometer THow much heat must be supplied to convert 10 g of ice at 0 °C into water at 50 °C? (Latent