What is temperature? In order to define temperature, we use a quantity.
This quantity will then tell us how hot or cold something is compared
with a standard temperature.
Now you may wonder what we mean by standard temperature. The standard temperature is the temperature at which water freezes.After careful experimentations and observations, Celsius defined this temperature to be 0 and we write 0°C.
Once we have 0 degree, which is the freezing point of water as our
standard, any temperature that is colder or warmer can be measured
relatively to 0 degree.
While 0 degree is the freezing point of water, 100 degrees is the boiling point of water.
Celsius is not the only scale that we use to measure temperature. Another commonly used scale specially in the United States is the Fahrenheit.
0 degree in the Celsius scale corresponds to 32 degrees in the Fahrenheit scale.0°C = 32°F
This means that the freezing point of water in the Fahrenheit scale is
32 degrees. We show you below an example of a thermometer with some
Celsius and Fahrenheit temperature.
Right now this thermometer reads 50 degrees Celsius or 122 degrees Fahrenheit.
We can also define temperature in terms of its kinetic energy. Recall kinetic energy refers to energy in action or something that is moving.
Recall also that we explained all matter is composed of atoms moving about lightly and quickly.
This kinetic energy in atoms or molecules is what causes something to become warm.
The warmer something is, the higher the kinetic energy generated by the atoms of that thing.
Recall also that the kinetic energy depends on the mass and the speed.
Since the mass of an atom is not likely to change, the magnitude of the kinetic energy will depend mostly on the speed.
This means that the warmer the object gets, the faster the movement of the atoms or molecules of that object.
The Kelvin scale is used mostly in scientific experiment. In this scale,
the number 0 is assigned to the lowest possible temperature.
For such lowest temperature, atoms or molecules in objects will not move and have no kinetic energy.
Take the temperature quiz below to see how well you understand the
concept of temperature. After completing this quiz with 100% accuracy,
you will know exactly what we mean by temperature in physics terms. You
will not need to use a paper and pencil to complete this quiz.
First, read this lesson about temperature and then take this quiz.
Objective of the temperature quiz:
Test your knowledge with the quiz below: