LEARNATHON

III

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

Learn more### Theory:

The temperature at which the pressure and volume of a gas theoretically reach zero is called absolute zero.

*Variation of pressure with temperature*

At a temperature of \(–273.15\) \(°C\), the pressure extrapolates to zero for all gases. It is called n as absolute zero or \(0\) \(K\). Some baseline temperatures in the three temperature scales are shown below.

Temperature | Kelvins(\(K\)) | Degree celcius(\(°C\)) | Degrees Fahrenheit(\(°F\)) |

Boiling point of water | \(373.1\) | \(100\) | \(212\) |

Melting point of ice | \(273.1\) | \(0\) | \(32\) |

Absolute zero | \(0\) | \(-273\) | \(460\) |

We can convert the values from one unit to another unit by using the formula,

**a**)

**Convert**\(30\)\(°C\)

**to**\(Kelvin\)

**Solution**:

$\begin{array}{l}{T}_{K}={T}_{\mathrm{\xb0}C}+273.15\\ {T}_{K}=30+273.15\\ {T}_{K}=303.15\phantom{\rule{0.147em}{0ex}}K\end{array}$

**b**)

**Convert**\(240\) \(K\)

**to**\(°C\)

$\begin{array}{l}{T}_{\mathrm{\xb0}C}={T}_{\mathrm{\xb0}K}-273.15\\ {T}_{K}=240-273.15\\ {T}_{K}=-33.15\phantom{\rule{0.147em}{0ex}}K\end{array}$