We have had a lot of equipment that helps us dry various objects easily. To help dry your hair after bathing, there is a hairdryer. There are also dryers that are used to dry clothes. In some public toilets, we also often find automatic hand dryers. In addition, there are many more drying technologies that are around us. If you pay attention, most of the dryers use hot air as a means of drying. Hmm, why does it have to be hot air? Can you use just air blowing or just heat as a dryer? The answer is yes, but the results are not as maximum as using both at the same time. Why is that?
Hot temperatures will make water quickly evaporate. This obviously can cause wet objects to dry out quickly. While blowing air can also dry an object. But the method used is different, namely to drive away from the water molecules attached to the object. Then how can the two work together to produce maximum drying?
You see, gusts of air can indeed expel water that sticks to things, but it’s very difficult. It would be easier if what was expelled was already in the form of water vapor. For this reason, the presence of hot air that speeds up evaporation of water will be very helpful. Blowing air from the dryer just drives away the water that has changed shape into steam, so that the water that is ‘expelled’ can be more.
However, it turns out that evaporation of water by hot air is also not easy. Evaporated water will fill the air above it. If the air above is full, the water cannot evaporate anymore. Although there are water molecules that turn into steam, there will also be molecules that will enter the water again because the room above is full. Well, blocking the water vapor carried out by blowing air from the dryer can make the space above the dried object remain relieved, not full of water vapor. As a result, the evaporation process can continue until finally, the object is completely dry.