Pressure Tanks are sometimes referred to as high pressures and are used to store, hold, and/or transfer gases, vapours, and fluids at pressures higher than atmospheric pressure. Pressure vessels are sealed containers that are used to store liquids, vapours, and gases at pressures that are significantly greater or lower than the atmosphere. Liquefied petroleum gas, liquefied natural gas, and liquid nitrogen are examples of liquids that need to be stabilised and kept under pressure.