Heat and temperature
We use the expressions of hot and cold in our daily life on a number of occasions. Heat is the sum of kinetic energy of all molecules of a substance whereas the degree of hotness and coldness of an object is called its temperature. This note presents information about heat and temperature.
Summary
We use the expressions of hot and cold in our daily life on a number of occasions. Heat is the sum of kinetic energy of all molecules of a substance whereas the degree of hotness and coldness of an object is called its temperature. This note presents information about heat and temperature.
Things to Remember
- Heat is the sum of kinetic energy of all molecules of a substance.
- We use heat for cooking food and keeping our body warm.
- We can get heat from coal, gas or electricity and sun.
- The degree of hotness and coldness of an object is called its temperature.
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Heat and temperature
Heat
Heat is the sum of kinetic energy of all molecules of a substance. We use the expressions of hot and cold in our daily life on a number of occasions. We use heat for cooking food and keeping our body warm. We can get heat from coal, gas or electricity and sun. The degree of hotness and coldness of an object is called its temperature. Temperature is usually measured in the Celsius scale or Fahrenheit. The normal human body temperature is 98.40 Fahrenheit or 36.90 Celsius.
Temperature
Temperature is a measure of how hot or cold a body is. Temperature is usually measured in the Celsius scale or Fahrenheit scale. Temperature of the system can be defined as the property that determines whether or not the body is in thermal equilibrium with the neighbouring system. If the number of systems is in thermal equilibrium, this common property of the system can be represented by the simple numeric value called temperature.
Differences between Heat and Temperature
The differences between heat and temperature can be summarised in points as follows:
| S.N | Heat | S.N | Temperature |
| 1. | Heat is the form of energy that flows from the system to its surroundings. | 1. | Temperature is the result of heat. |
| 2. | Mass of the body affects the total heat. | 2. | Mass of body does not effect on temperature but depends on the molecular vibration of the body. |
| 3. | Heat is measured in joules or calories. 4.2 Joules = 1 calorie | 3. | Temperature is measured in degree Celsius or degree Fahrenheit or Kelvin Scale. |
| 4. | Heat is measured by using a Calorimeter. | 4. | Temperature is measured using the thermometer. |
Lesson
Heat
Subject
Science
Grade
Grade 8
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