Physics

To define a temperature scale, two reference temperatures are chosen, these two temperatures are called the fixed points.

If it had been possible to heat a liquid without keeping it in a vessel, the real expansion of the liquid that would be obtained is called the real expansion of the liquid.

To melt a solid substance into liquid by applying pressure and again to bring it back to the solid state by reducing the pressure is called regulation.

There are boiling volcanos beneath the earth. Till now it is impossible to convert and use this energy. But in some places, this heat energy can be converted and used in a limited manner. This is geothermal energy.

The energy which is obtained due to molecular vibration or motion of a substance is called heat.

The property of a substance which changes with temperature, and measuring the change accurately, the temperature can be measured, is called thermometric property.

The triple point of water refers to the particular temperature and pressure at which water remains at all its three states – solid, liquid, and gaseous. The triple point of water is the temperature and pressure at which liquid water, solid ice, and water vapor can coexist in thermodynamic equilibrium. It is the single combination … Read more

The fourth state of matter is called the plasma state. Plasma is the ionized gas at a very high temperature. It is formed at a few thousand degrees of temperature. It has no definite shape and volume like gases.