Eli5 when it’s windy outside why does the water in toilets swish a little bit?

Question

Eli5 when it’s windy outside why does the water in toilets swish a little bit?

In: 1241

Answer 1

Your toilet, and all plumbing, has a vent that goes outside so that you can flush and drain smoothly. If it’s very windy, air pressure from the wind blowing across that vent can affect the water in the toilet bowl.