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.
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.”
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.”
“I鈥檝e done this always with zero understanding of fluid dynamics鈥m 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!鈥 claimed a fifth
Someone else added: “This is the coolest thing I鈥檝e learned in a while! Thank you!”