Water droplets appear on the mirror when air is blown why ?
Answers
Answer:
Nearly all the water on earth has been here since the earth was formed. It recycles through something called the water cycle. The water cycle is controlled by the Sun, which produces energy in the form of heat. This heat energy causes the water in the world's oceans, lakes, and even puddles in our backyard, to warm and evaporate. As the water evaporates into a vapor it rises in the atmosphere and cools. As the water cools high in the atmosphere it undergoes condensation back to a liquid and eventually forms a cloud. When the cloud gets heavy with water, precipitation occurs and water falls to the earth as rain. After the precipitation, the water evaporates and the process occurs all over again.
The amount of water vapor in the air varies with the time of day, weather, and location. Air with lots of water in it is said to be humid. Air without much water in it is said to be dry. How much water is in the air can be measured in a humidity chamber. Cobalt paper is an indicator for a humidity chamber and is blue when in dry air and turns pink in humid air.
Water changes its states based on the energy of its molecules. If their energy is low they will exist as solid ice, with more energy they exist as liquid water and the highest energy water molecules exist as a vapor or gas. In liquid water, when some of the liquid molecules get enough energy, they can escape the liquid phase and become a vapor even if the water isn't boiling. This is the process of evaporation. When vapor molecules of water cool their energy decreases and they change from the vapor state to the liquid state. This is called condensation. After precipitation, some of the water seeps into the soil and some of the water runs off over the land and into bodies of water such as rivers and lakes.
On blowing air from the mouth on the mirror, the mirror becomes moist. The air blown from mouth is hot and the mirror is cold. The hot air that we breathe out contains water vapors which turn into tiny droplets of water when it comes in contact with the colder mirror. This makes the mirror moist and hazy.
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