Concept of temperature — lesson. Science State Board, Class 9.

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The degree of hotness or coolness of a body is measured by its temperature. The higher the temperature, the hotter the body.

Kelvin is the SI unit of temperature (

$K$ ). Celsius (

$°C$ ) is used in everyday applications. A thermometer is used to determine the temperature.

There are three temperature scales, they are

Fahrenheit scale:

The freezing and boiling points in Fahrenheit are

$32$ degrees Fahrenheit and

$212$ degrees Fahrenheit, respectively. The interval has been broken down into

$180$ segments.

Celsius scale:

The freezing and boiling points on the Celsius scale (also known as the centigrade scale) are

$0°C$ and

$100°C$ , respectively. The interval has been broken down into

$100$ pieces.

The formula to convert a Celsius scale to Fahrenheit scale is:

$F = \frac{9}{5} (C + 32)$
The formula for converting a Fahrenheit scale to Celsius scale is:

$C = \frac{5}{9} (F - 32)$

Kelvin scale(Absolute scale):

Kelvin scale is also known as the absolute scale. Absolute zero, or

$0$

$K$ on the Kelvin scale, is the temperature at which a substance's molecules have the lowest possible energy. At

$273.16$

$K$ , the solid, liquid, and gaseous phases of water can coexist in equilibrium.

Kelvin is defined as

$1/273.16$ of the triple point temperature.

The formula for converting a Celsius scale to a Kelvin scale is:

$K = C + 273.15$

Temperature scales

Reference:

https://commons.wikimedia.org/wiki/File:Temperature_Scales.png

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7. Concept of temperature