# Ideal Gas

Show/Hide Sub-topics (Thermal Physics | A Level)

Ideal gas

• a gas which obeys pV=nRT
• does not exert long-range forces on each other
• occupy negligible volume(very small fraction of total volume of container)

Most gases behave like ideal gas when pressure is low (concentration of air molecules is low) and temperature is high (much higher than boiling point). $\rightarrow$ No force of attraction between particles during collisions

Internal energy for monatomic ideal gas $\rightarrow$ $U = E_{k}$ $\rightarrow$ Depends on temperature

Useful equation linking pressure, volume and temperature:

$\frac{P_{1} V_{1}}{P_{2} V_{2}} \, = \, \frac{T_{1}}{T_{2}}$