Question 1

Which law states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other?

Accepted Answer

Zeroth law of thermodynamics. The zeroth law defines thermal equilibrium and the basis of temperature. If A is in equilibrium with B and B with C, then A is also with C. This idea allows thermometers to compare temperatures reliably.

Question 2

Temperature is most directly related to which microscopic quantity?

Accepted Answer

Average kinetic energy of particles. Temperature reflects the average kinetic energy of the particles in a substance. Faster random motion generally means higher temperature. This is why gases expand and exert more pressure when heated.

Question 3

What is the SI base unit of temperature?

Accepted Answer

Kelvin. The kelvin is the SI base unit for temperature. It is an absolute scale used in science and engineering. One kelvin step is the same size as one degree Celsius step.

Question 4

Which statement best describes heat in physics?

Accepted Answer

Heat is energy transferred due to a temperature difference. Heat is energy that flows from a hotter body to a colder body because of temperature difference. It is not a property contained permanently in a body like mass. Its SI unit is the joule.

Question 5

Which temperature scale is commonly accepted as an absolute thermodynamic scale?

Accepted Answer

Kelvin scale. The kelvin scale is an absolute temperature scale starting from absolute zero. It avoids negative values for ordinary equilibrium temperatures. Gas laws are typically written using kelvin.

Temperature — Set 1