Because hand sanitizer is typically at least 60% ispropyl alcohol or ethyl alcohol. Alcohol molecules aren’t stuck together as strongly as water molecules, so it takes a lot less energy for them to separate, meaning alcohol evaporates much faster than water, especially when it’s in contact with your warm skin.
Hand sanitizer is made with special ingredients that help to kill germs on your hands. One of these ingredients is alcohol, which is a very good cleaner but it also evaporates quickly. When you put some hand sanitizer on your hands, the alcohol in it starts to evaporate, or turn into a gas. As it evaporates, it takes the water and other ingredients with it, which makes your hands feel dry. This is why hand sanitizer dries so quickly – the alcohol in it is turning into a gas and taking the water and other ingredients with it. This helps to kill germs on your hands and keep them clean.
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