The simplest way of getting rid of liquid water is to turn it into a vapor (broadly speaking, that means a gas produced from a liquid)—and the easiest way to do that is to heat it up. The molecules in a liquid are closer and more tightly bound together, move more slowly, and have less energy than the molecules in a gas. (This idea is part of the kinetic theory of matter—a way of understanding how solids, liquids, and gases behave by thinking about the molecules inside them buzzing about in constant motion.) If you want to turn a liquid into a gas, you need to put in quite a bit of energy so the liquid molecules can break apart, escape from the bulk of the liquid, and form a vapor above it. Putting heat into a liquid is an easy way to achieve this. Heat a liquid and you make the molecules, on average, more energetic so they have more chance to escape. Heat it enough and all the molecules will eventually evaporate—in theory, at least—leaving you with no liquid at all. So one way to dry wet clothes is to heat them up, turn the water they contain into steam, and then extract the steam so dry clothes are left behind. That’s roughly how a tumble clothes dryer machine works, as we’ll discover in a moment.
Everyone loves fresh, clean clothes—but how many of us enjoy the chore of getting them that way? Not many! Why? Because the process of cleaning clothes with water and detergent is inefficient, laborious, and time consuming. Clothes washing machines do a superb job of rinsing away the sweat and dirt our garments pick up each day, typically in less than an hour, but they have one mighty drawback: they give you back your clothes clean but soaking wet! Before you can put your t-shirt and jeans back on, you need to get rid of a huge amount of water, either by indoor or outdoor drying. What’s the best way to do that? Let’s look at the science and find out!
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