Propane under pressure remains in a ________________state.

Propane under pressure remains in a liquid state due to the physical properties of the substance. When propane is stored in pressurized tanks, the high pressure causes the gas to condense into a liquid form. This occurs because the molecules are forced closer together, allowing propane to exist as a liquid at room temperature when under sufficient pressure.

As the pressure decreases, such as when the propane is released from its tank, the liquid propane can transition back into a gaseous state. The application of pressure is critical to keeping propane in its liquid form, which is why it is commonly transported and used in this state for efficiency and ease of handling. Understanding this property is essential for safe and effective use of propane in various applications, including thermite welding processes where it's often used as a fuel source.