Question

in the diagram below, particles of the substance are moving from the liquid phase to the gas phase at the same rate as they move from the gas phase to the liquid phase.
the gas and liquid are at

• equilibrium.
• a high vapor pressure.
• a low vapor pressure.
• zero vapor pressure

Explanation:

When the rate of particles moving from liquid to gas equals the rate of particles moving from gas to liquid, the two phases are in a state of dynamic balance, which is defined as phase equilibrium. Vapor pressure describes the pressure of the gas phase, but the given condition directly defines equilibrium rather than vapor pressure magnitude.

Answer:

equilibrium.