Hello everybody.., would you kindly help me to understand one of van der waal's theory by Van der Waal, who gives an explanation of the nonideal behavior of gases. Van der Waal added two more items to this model and showed that they can account for deviation of real gases from ideal behavior. they are: 1. Volume occupied by the gas molecules. and 2. The attractive forces between the molecules. I'm still a little bit confused in first one..,

Question

Hello everybody.., would you kindly help me to understand one of van der waal's theory by Van der Waal, who gives an explanation of the nonideal behavior of gases. Van der Waal added two more items to this model and showed that they can account for deviation of real gases from ideal behavior. they are: 1.  Volume occupied by the gas molecules. and 2.  The attractive forces between the molecules. I'm still a little bit confused in first one..,