The exact way to get your car to cool down in seconds for the school run WITHOUT AC, according to genius science formula

The Sun

a day ago

A SAVVY maths professor has shared the easy way to get your car cool in seconds for the school run.
Hannah Fry, from the UK, took to social media to give us all a lesson in fluid dynamics.
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Cars can become super hot in the summer, and it often takes a while for the AC to kick in and cool it down.
But Hannah shared the simple trick to get it cool in seconds.
She said: "You know that thing when you get into your car in the summer and it's absolutely boiling hot?
"There's actually a flow dynamics trick that you can use to quickly cool your car down. That's what my PhD's in, flow dynamics."
Instead of putting the air conditioning on, she rolled down the window behind the driver's seat and stepped out of the car.
Then, using the passenger side door, she would stand and open and shut it quickly for a few seconds.
Hannah did this a few times before getting back in the car as she was getting embarrassed.
"The reason why it works is that when you open and close the door, especially if you do it quickly, the door, as it's moving outwards, it sweeps out all of the air that's in its way, creating this sort of area of low pressure that you get here," she explained.
"Then that sets up something called bulk flow, which is where all of the hot, sweaty, horrible air inside the car is drawn outwards. And the only way to refill it is with nice, fresh, easy air from over that side.
"It takes about two or three goes and suddenly it's absolutely beautifully temperate."
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The clip has since gone viral on her TikTok account @ fryrsquared with over 1.9 million views and 150k likes.
The clever hack comes just in time for summer and people were grateful for the advice.
One person wrote: "Never be embarrassed about fluid dynamics, babe."
Another commented: "you lowkey deserve to be nominated for the Nobel Prize."
How to keep cool in hot weather
Most of us welcome hot weather, but when it's too hot, there are health risks. Here are three ways to keep cool according to the NHS...
Keep out of the heat if you can.
If you have to go outside, stay in the shade especially between 11am and 3pm, wear sunscreen, a hat and light clothes, and avoid exercise or activity that makes you hotter.
Cool yourself down.
Have cold food and drinks, avoid alcohol, caffeine and hot drinks, and have a cool shower or put cool water on your skin or clothes.
Keep your living space cool.
Close windows during the day and open them at night when the temperature outside has gone down. Electric fans can help if the temperature is below 35 degrees. Check the temperature of rooms, especially where people at higher risk live and sleep.
"I've done this always with zero understanding of fluid dynamics…Am I a genius?" penned a third.
Meanwhile a fourth said: "My dad used to tell me off for doing this as a kid, can't wait to show him I was actually just a child genius."
"This is genius!' claimed a fifth