CHEMISTRY [2 Mark Question Answer]

As the pressure increases, the boiling point of water also increases. A pressure cooker works on this principle. In a pressure cooker, the pressure is high and therefore the water boils at a temperature above 100°C.

Loading is a method of removing suspended impurities in water in which water is treated with potash alum to increase the rate of sedimentation in a loading tank. Mixing with potash alum, fine suspended particles become heavy and they settle down at the bottom of the tank.

The continuous circulation of water from the earth to the atmosphere and back to the earth is called as the water cycle. This cycle involves evaporation, condensation and precipitation. The water cycle is also called as hydrological cycle.

Some amount of water from the sources of surface water and rain seeps into the ground and collects above the non- porous rocks to form groundwater. Sources of groundwater include springs and wells.