Does this trick seem like chemical magic....or more physics?

Question

I
Turn an open bottle upside-down for a draining experience... or maybe not.

Ingredients:

-Water (Do Not use a carbonated beverage like soda for this trick.)

- Empty glass drink bottle (any kind will work)

- Paper napkin or any small piece of paper

The Recipe:

1) After you finish emptying a glass bottle, refill it to the brim with water. Fill it so high that you get a little water bulging at the top of the bottle.

2) Tear-off or find a piece of paper that is a little bigger than the mouth of the bottle.

3) Place the paper over the mouth of the bottle.

4) Lightly tap the paper on top of the bottle to make sure it gets wet and makes a good seal with the bottle's glass lip.

when you flip it over the water doesnt drip.

Answer 1

Physics. The trick demonstrates air pressure.

Answer 2

its more along the lines of physics its a pretty common thing to do if you ever look at all the gaskets in an engine thats basically the same thing

Answer 3

physics for sure. its because the paper holds the water in place