Which of the following factors can affect propane container pressure?

The amount of liquid propane in a container is the key factor affecting propane container pressure due to the vaporization and equilibrium between the liquid and vapor phases. As the amount of liquid propane changes, it alters the pressure exerted by the vapor in the space above the liquid in the container. In a pressurized container, the pressure increases as the volume of liquid increases until equilibrium is reached, while a decrease in liquid volume can lead to reduced pressure.

Understanding this relationship is crucial because it highlights how maintaining the proper liquid level in a propane tank is necessary for ensuring safe and efficient operation. For example, a tank that is too empty may not provide adequate pressure for proper vaporization and fuel delivery, while an overfilled tank could lead to dangerously high pressures.

The other factors mentioned, while potentially influencing system performance, do not directly impact the pressure within the propane container itself. The type of gas, distance from the heating source, and quality of the burner relate more to combustion efficiency and delivery mechanisms rather than to the intrinsic pressure dynamics within the propane container.