When you open a fridge or a freezer and then close it again, why does it become harder to open again right after?
In: 4090
You know those experiments where you fill a bottle with a little boiling water, shake it, put the cap on and then run cold water over it?
The bottle collapses in on itself because hot air takes up more space than cold air, and cooling the air makes it shrink. The plastic gets sucked inward to reduce the space in the bottle because there’s no way for air to get in and fix that imbalance the usual way.
If you’ve ever covered a syringe’s tip and then pulled, it pulls back. The fridge is the same general idea, except with the heat change above causing it to pull back rather than just not having the air there in the first place. Warm air from outside gets in and then gets chilled. Until you break the seal on the fridge, it pulls like that.
Edit: It happens in reverse too. An oven door would pop open if it didn’t have a vent.
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