Zeroth law of thermodynamics is known as the law of thermal equilibrium.
This law states that the two systems that are in thermal equilibrium with the third system then the two systems will be in equilibrium with each other.
According to this law, if two systems A and B individually are in thermal equilibrium with third system C, then systems A and B will also be in thermal equilibrium with each other.
Thermal equilibrium is a condition where two systems in equilibrium exchange no heat energy. There is no change in temperature.
The zeroth law of thermodynamics states that if two thermodynamic systems each are in thermal equilibrium with a third, then they are in thermal equilibrium with each other.
The solar radiation is first intercepted by Earth's atmosphere, just a small part of the radiation is absorbed by gases such as water vapor. Some of the radiation is reflected back to space by the clouds and Earth's surface.
