Anyone that’s known me for more than a few years will know that I am not exactly the biggest fan of cleaning. I like to hoodwink people into thinking I have things sorted and that I exude domestic goddess status but in reality, I honestly don’t care that much. This is slightly problematic for someone with a crazy dust allergy but at the risk of this becoming a personal confessional, let’s move on shall we?
This deficiency in ability-to-adult is possibly why, when handed a vacuum cleaner as a pivotal prop to use in one of my shows and told to explain how it worked, I laughed hysterically.
But then it occurred to me that it’s highly likely the vast majority of people who frequently use a vacuum cleaner, have no idea how it works either. It’s like any piece of commonplace machinery in modern life; we use it but if asked to pull it apart and put it back together we’d end up with a mess.
Vacuum cleaners, it turns out, don’t suck. In fact a “vacuum” is more than a misnomer – it’s entirely not how they don’t suck and to explain just exactly how they don’t suck, I’m going to need to explain pressure.
First things first we need to think about air pressure. Take a look at your thumbnail. It’s about one square centimeter in area right? Well now I want you to imagine there’s a 1L carton of milk balancing on it. Heavy? Awkward? A contrived gedanken experiment? All answers to these questions should be “yes”. If you ever get a chance, you can actually feel what this is like. All you need to do is get a plastic bag and a vacuum cleaner (stay with me). Wrap the plastic bag around your hand and remove the air from inside it with the vacuum cleaner. You should be able to feel the air outside the bag, pressing onto your skin. Atmospheric pressure is CRAZY.
Vacuum cleaners work on the principle that any areas of high (so higher than atmospheric) and low pressure, if given the opportunity, will want to equalise. This means we can have some fun like this (with added cute-factor) or this (skip to 2 minutes for awesomeness). Now inside a vacuum cleaner, there’s a chamber with a fan. This fan is constantly rotating and works to push the air out of the chamber creating an area of low pressure. This means that the high pressure outside of the vacuum cleaner, instead of getting sucked in, is pushed in so that the high and low pressure equalises.
So vacuum cleaners don’t suck. I’ll definitely be thinking about how I know that the next time I “clean my carpets”*.
*”leave the vacuum cleaner in the cupboard to languish for eternity”.