What is zero point energy ? Can a gas achieve it ?Is zero point energy can only be achieved by a solid or liquid ? Is there any process by which a...

In classical physics an ideal gas can be theoretically
cooled to absolute zero when all particles come to a complete halt. Quantum mechanics
and the Heisenberg Uncertainty Principle in particular predict that particles can never
become completely motionless but always have some small amount of residual kinetic
energy. This is the zero point energy. Helium has the lowest boiling point of all
substances which is still above zero kelvin (absolute zero). This means that even helium
is liquid at these low temperatures. The reason it doesn't remain a gas is that when
cooled sufficiently Van der Waals attraction forces are enough to cause helium atoms to
form the weak bonds necessary to condense into a liquid. All other gases condense at
much higher temperatures.