Steam

Steam is water in a gaseous form, often mixed with air or tiny drops of liquid water. It can form through evaporation or boiling, where heat turns water into vapor. When water turns into steam, it expands dramatically—about 1,700 times its original volume. This change in size can be used to do work, such as powering steam engines.

Steam engines were very important during the Industrial Revolution, helping to change how people lived and worked. Today, steam is still very useful, as it helps create most of the world's electricity. In some situations, like when water touches something extremely hot or loses pressure very quickly, steam can cause sudden and powerful bursts known as steam explosions.

Types of steam and conversions

Steam is made by heating water, often using coal or other fuels, but it can also be created with solar energy. When steam contains tiny water droplets, it is called "wet steam". As this steam is heated more, the droplets disappear, and at a certain temperature, all the water turns into vapor. This is called "saturated steam".

When steam is hotter than the temperature at which water normally boils for its pressure, and there is no liquid water left, it is called superheated steam or live steam. Engineers and scientists use special tables and diagrams, like steam tables and phase diagrams, to understand how steam behaves in different situations.

Uses

Steam is used in many ways. In agriculture, it helps make the soil healthier without using harmful chemicals. At home, steam can cook food, clean fabrics and carpets, heat buildings, and remove wrinkles from clothes.

Steam is very important for making electricity. About 90% of the world’s electricity comes from steam. After helping make electricity, steam can also heat buildings. Steam can store energy, too, because it holds a lot of heat. It powers machines and can clean and sterilize things, like tools in labs. Steam is also used in factories and industries to heat things, clean equipment, and help make chemicals. It can bend wood, help dry concrete, and clean engines and kitchen equipment.