Learning Task No.2: Using the same diagram above, state the Second Law of
Thermodynamics. Write three sentences on the differences between heat and
temperature.
(pls answer)
Answers
Explanation:
1. Heat
Heat is a form of energy that can transfer from hot body to cold body.
Heat is the total kinetic energy and potential energy obtained by molecules in an object.
Heat flows from hot body to cold body.
It has a working ability.
Its SI unit is “Joule”.
It is measured by the calorimeter.
It is represented by “Q”.
2. Temperature
Temperature is the degree of hotness and coldness of a body.
Temperature is the average K.E of molecules in a substance.
It rises when heated and falls down when an object is cooled down.
It does not have the working ability.
Its SI unit is “Kelvin”.
It is measured by the thermometer.
It is represented by “T”.
The Second Law of Thermodynamics:
The second law of thermodynamics states that the total entropy of an isolated system (the thermal energy per unit temperature that is unavailable for doing useful work) can never decrease.
The differences between heat and temperature:
- Heat is a form of energy while temperature is the measure of the degree of hotness or coldness of a body.
- Heat is the total kinetic energy and potential energy obtained by molecules in an object while the temperature is the average K.E of molecules in a substance.
- Heat is measured in joules while the temperature is measured in Kelvin.