LEARNATHON

III

Competition for grade 6 to 10 students! Learn, solve tests and earn prizes!

Learn more### Theory:

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
- Celsius or Centigrade scale
- Absolute scale or Kelvin scale

**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