Overview

• Fry demonstrated rolling down one nearside window and rapidly opening and closing the opposite door to trigger bulk flow that cools a hot car cabin.
• The process exploits low-pressure areas created by the moving door to draw out trapped hot air and replace it with fresh outside air.
• A TikTok clip of the trick has amassed more than 1.9 million views and 150,000 likes as users called it ingenious.
• The UK Health Security Agency has issued heat alerts for regions including London and the Midlands as temperatures rise.
• Fry, whose PhD focused on fluid dynamics, says just two or three quick door swings can leave the cabin comfortably cool.