How thermometer is an application of zeroth law?

When a thermometer is used to measure our body temperature the glass wall attains thermal equilibrium with our body. Using the zeroth law of thermodynamics we can say that our body and mercury are in thermal equilibrium i.e. in same temperature. This is how mercury thermometer measures the temperature.

How does zeroth law gives the definition of temperature?

The Zeroth law of Temperature states that. “Heat flows from one source to an other only if there is a temperature difference between the two. Two systems are in thermal equilibrium if they are at same temperature.”

What is the main application of Zeroth thermodynamic law in physics?

Zeroth Law of Thermodynamics Example and Applications This law is mostly used to compare temperatures of different objects. If we want to measure the accurate temperature, a reference body is required and a certain characteristic of that body which changes with temperature.

How is the zeroth law of thermodynamics applied in a premature baby?

As an example of the zeroth law in action, consider newborn babies in neonatal intensive-care units in hospitals. Prematurely born or sick newborns are placed in special incubators. These babies have very little covering while in the incubators, so to an observer, they look as though they may not be warm enough.

How does the zeroth law of thermodynamics confirm the thermal equivalent state try to explain how a thermometer works?

The zeroth law of thermodynamics is the working principle of a thermometer. The zeroth law states that if two bodies are in thermal equilibrium with the third body, then the first two bodies are in thermal equilibrium. The temperatures of the bodies are equal when they are in thermal equilibrium.

How does the Zeroth Law of Thermodynamics confirm the thermal equivalent state try to explain how a thermometer works?

Why is Zeroth Law of Thermodynamics important?

The law is important for the mathematical formulation of thermodynamics. Mathematically, the zeroth law makes the relation of thermal equilibrium between systems an equivalence relation, which is precisely the type of relation that can represent equality of some quantity associated to each system.

Why is zeroth law of thermodynamics important?

How does thermal equilibrium leads to Zeroth Law of Thermodynamics?

Explanation : If two different temperature of system are kept in contact . Heat transfer from hot to cold body . Generally at thermal equilibrium the temperature of two systems is same . This concept leads to Zeroth law of thermodynamics .