Absolute Temperature Scale

Jul 19, 2024

2-minute read

Table of Contents

This is also known as the thermodynamic temperature scale
The Kelvin is the unit for the absolute temperature scale
$0\degree C$ is equivalent to $273\ K$
The distance between two consecutive units on the Kelvin scale is the same for two consecutive units on the Celsius scale e.g. the jump from $1\degree C$ to $3\degree C$ is the same as that from $274\ K$ to $276\ K$

To convert degrees Celsius to Kelvin simply add $273$ to the number and change the unit to Kelvin

e.g. $5\degree C\equiv (5+273)K=278\ K$

Thus to convert from Kelvin to degrees Celsius, we subtract $273$ and change the unit to degrees Celsius

e.g. $275\ K\equiv (275-273)\degree C=2\degree C$

Convert the following to Kelvin:

Convert the following to degrees Celsius:

Phases of Matter

There are three ($3$) states of matter: solid, liquid and gas. The similarities and differences are:

Property	Solid	Liquid	Gas
Shape	Definite	Takes the shape of its container	Indefinite
Volume	Definite	Definite	Indefinite
Intermolecular forces	Strong	Mutual attraction among particles, not strong enough to give the liquid a defined shape	Weak
Motion of particles	Particles can vibrate about their fixed positions	Particles move about chaotically, similar to gases	Particles are in continuous random motion

This is the phenomenon whereby materials tend to expand when heated and contract when cooled.

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