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The behaviour of a real gas is usually depicted by
P plotting compressibility factor \( Z \) versus \( P \) at a constant

W temperature. At high temperature and high pressure, \( \mathrm{Z} \) is usually more than 1 . This fact can be explained by Vander Waal's equation when
(1) The constant \( a \) is negligible and not \( b \)
(2) The constant \( b \) is negligible and not \( a \)
(3) Both constants \( a \) and \( b \) are negligible
(4) Both constants \( a \) and \( b \) are not negligible
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