Test: A Journey through States of Water - Class 6 MCQ

When water is sprinkled on a hot surface, it heats up and turns into steam (water vapor) due to evaporation.

Evaporation is the process where liquid water changes into water vapour (gas). This happens when water gets heated, like when clothes dry in the sun or when water in a pan turns into steam.

Water vapour is the gaseous form of water, and it is invisible. While it’s present in the air around us, we can’t see it unless it condenses into tiny droplets, forming steam or clouds​.

During condensation, water vapour (gas) loses heat and changes back into liquid water. This is why we see water droplets on the outside of a cold glass or in the formation of clouds​.

• Condensation is the process where water vapor in the air cools down and changes back into liquid water.
• This process is essential for cloud formation, as tiny droplets gather in the atmosphere.
• When these droplets combine and grow larger, they eventually fall as precipitation, such as rain.
• Thus, condensation plays a crucial role in forming clouds and rain

• The fan does not lower the room temperature but creates airflow.
• As air moves, it increases the rate of evaporation of sweat on our skin.
• Evaporating sweat takes heat away from the body, making us feel cooler.
• This process is especially effective in hot, humid conditions where sweat may not evaporate easily.
• The sensation of cooling is primarily due to the enhanced evaporation, not the actual air temperature.

On a windy day, the moving air helps to carry away the moisture (water vapour) from the clothes, allowing more water to evaporate quickly. This makes clothes dry faster compared to when there is no wind​.

An AWG machine collects moisture from humid air by cooling it, causing water vapor to condense into liquid water.

Air containing water vapor rises because it is less dense than the surrounding air.