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In our daily life, we frequently get confused between the terms heat and temperature. We hear the word temperature often in weather forecasts, but do we know whether there is any difference between temperature and heat?
Yes! There
is a slight difference between heat and temperature.
Parameters to be compared | Heat | Temperature |
Definition | It is defined as the flow of energy from hotter to cooler objects. | It is defined as the measurement of the hotness or coldness of a substance. |
Property | It flows from hotter to cooler objects. | When we heat, the temperature rises, and it falls, when we cool. |
Particle | It depends not only on the temperature of the substance but also on the number of molecules in the object. | It is related to how fast the atoms or molecules move or vibrate within the substance and determines the heat flow direction. |
Measures | The total kinetic energy of the molecules in the substance. | The average kinetic energy of the molecules. |
SI Unit | Joule | Kelvin |
Unit | Joule, Calorie | Kelvin, Fahrenheit, Celsius |
Symbol | Q | T |
Measuring Instrument | Calorimeter | Thermometer |
Working ability | It can do work. | It is used to measure the degree of heat. |
Now we will have a closer look at heat and temperature.
When we add heat to the object, what will happen?
Following are the results due to the heating of the object.
- Rise in temperature - While we heat the substance, the kinetic energy of the substance increases, resulting in an increase in molecules' motion. Due to the higher molecular motion, a temperature rise happens.
Rise in temperature
- Change of Phase or State - for example, if we heat the water above its boiling point, it results in the transformation of the liquid into its vapour without raising the temperature. At sea level, water boils at \(100\) °\(C\).
Change of state
Boiling Point:
The boiling point is defined as the temperature at which the pressure exerted by the environment upon a liquid is equalled by the pressure exerted by the vapour of the liquid.
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