The Sponge Equilibrium Question
This is a simple question. What is the moisture content of the two sponges at equilibrium? Please think about your answer carefully, before moving forward.
Basically, we want a room temperature closed box that has an inch of pure water at the bottom. We then hang a wet sponge and a dry sponge in the box and wait until they reach equilibrium. There aren't any details that are hidden, there are no tricks here. Just an honest box with a couple of sponges. We could have used one sponge of any saturation level, but I think that two sponges helps to visualize the outcome. Let's specify the details:
- Importantly, our system is isolated. Which means that neither mass nor energy, can enter or leave our system.
- Our system is on the surface of the Earth, so we are under the influence of gravity.
- Our sponges are in a closed box. The size is irrelevant as long as it's big enough for our apparatus. For easy visualization, let's say the bottom side is 1 meter in length.
- The box if filled with common air.
- Our box has a pool of water at the bottom, it's depth isn't important, but let's say that it is 5cm deep.
- The temperature of the isolated system is 20C(68F).