Question

Boyle's temperature or Boyle point is the temperature at which a real gas starts behaving like and ideal gas over a particular range of pressure. A graph is plotted between compressibility factor $Z$ and pressure $P$.
What is the variation of $Z$ will pressure?

• A. At very low pressures, all gases show $Z\approx 1$
• B. At high pressures, all gases show $Z>1$
• C. At intermediate pressures, all gases show $Z<1$
• D. All of the above

Answer 1

Answer: (D)

All of the above

$A)$ At very low pressures, the negative deviation from ideal behavior is not much. So, all gases show $Z\approx 1.$

$B)$ At high pressure all the gases show more positive deviation from the ideal behavior and have their values as $Z>1.$

$C)$ At intermediate pressures, the values are minimum for $Z$ and there are in negative phase; thus $Z<1.$