Mention of causes for the deviation of ral gas from ideal behaviour.

Explanation

For an ideal gas, `PV=RT`

However, the value of pressure `xx` volume is not constant for real gases. A graph of pressure along X-axis and PV along y-axis straight line parallel to X-axis for an ideal gas. PV versus P graph shows deviation in case of real gases. These graphs are called .. Amagat. s curve.s ... Ex: Easily liquegiable gases like `CO_(2) and NH_(2)` show a greater deviation from ideal behaviour but gases like H and He deviate deviate to smaller extent.
At low pressure : For gases except `H_(2)` and He, the value of PV decreases gradually with increases 1n pressure.
At high pressure : As pressure is increased the PV value decreases and becomes a minimu.
`:.` it gradually increases with increases in pressure. The deviation becomes greater at high pressure.