Which evaporates more quickly: 55 mL of water in a beaker with a diameter of 4.5 cm, or 55 mL of

step 1 We are going to compare evaporation rates in two different containers. Say we've got 55 millilit

Which evaporates more quickly: 55 mL of water in a beaker...

Which evaporates more quickly: 55 $\mathrm{mL}$ of water in a beaker with a
diameter of $4.5 \mathrm{cm},$ or 55 $\mathrm{mL}$ of water in a dish with a diameter of
112 $\mathrm{cm}^{2}$ Is the vapor pressure of the water different in the two containers?
Explain.

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Vapor Pressure

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid at a given temperature. It is an intrinsic property of a liquid and depends solely on temperature and the nature of the liquid, not on the container's shape or size. Thus, even if the rates of evaporation differ due to surface area, the vapor pressure of the water remains the same in both containers.

Surface Area and Evaporation Rate

The rate of evaporation is directly related to the surface area of the liquid exposed to air. A larger exposed surface area allows more molecules to escape at any given time, thereby increasing the evaporation rate. This concept is central to the problem, as different container dimensions result in different surface areas even though the volume of water remains constant.

Evaporation Process

Evaporation is the process by which molecules at the surface of a liquid gain enough kinetic energy to overcome intermolecular forces and escape into the air as vapor. The rate of evaporation depends on factors such as temperature, air movement, humidity, and the surface area of the liquid. This concept explains why two systems with the same volume of water can evaporate at different rates if their exposure to air differs.

Transcript

Please give Ace some feedback