Question

A bucket of water is placed in a room at 15 degrees with relative humidity of 40 percent.The volume of room is 50 cubic metre

Answer 1

Relative humidity is a percentage that is the quotient of two other percentages. It is the percentage of water vapor actually in the air divided by the maximum percentage of water vapor that the air can hold at that temperature. Thus, when there is no water vapor in the air, it is at 0% relative humidity. When the air is holding all it can at its temperature, it is at 100%.

Warmer air can hold more water vapor than colder air. That is why, in cold weather, when we heat up air inside our homes, it feels dry even though there is no difference in the actual amount of water in the heated air. But at its lower relative humidity our bodies are evaporating more water and we feel uncomfortably dry. We often add extra water vapor through a humidifier.

In warm weather, when the relative humidity gets too high, we can’t cool ourselves a much by evaporation through our pores, so our dampness makes us uncomfortable. We often say, “It’s not the heat; it’s the humidity.” This is also why our air conditioners, that are reducing the air’s temperature, often drip water. The cooler air can’t hold as much.