Zeroth law of
thermodynamics: zeroth law of thermodynamics is on the basis of
temperature measurement.
Zeroth law states that if two bodies are in thermal equilibrium with a third
body then they’re in thermal equilibrium with each other.
From the above image if A is connected to
B and are in thermal equilibrium with each other and body B is connected to C
and are in thermal equilibrium with each other then both A and C are in thermal
equilibrium with each other.
Thermal equilibrium:
when there
are variations in temperature from point to point of an isolated system, the
temperature at every point first changes with time. This rate of change
decreases and eventually stops. When no further changes are observed, the
system is said to be in thermal equilibrium.
Why it is named Zeroth law?
Application of zeroth law of thermodynamics:
It is called the
"zeroth" law because it was observed (as it is a observation) to light after the first and
second laws of thermodynamics, but as it was considered more fundamental and a base for other laws of thermodynamics it was given a lower number "zero".
The very basic use of zeroth law is used to compare & measure temperature.
This law is used to measure temperature & also to calibrate thermometer.
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