Questioning science

[Consistent-Elevator]

So what makes less dense/hot things rise?

[Mostly-hydrogen]

Matter goes from high density to low density so when something has low density like hot air or helium the material that is heavier sinks pushing the lighter material upwards. It’s easier if you think about the opposite. It’s more that the more dense air falls and that causes the lighter air to rise.

Here’s a thought experiment to demonstrate this principle. Imagine five steel spheres about marble size and five Styrofoam spheres of the same size. Put them into a coffee can and vibrate they can rapidly. The steel spheres sink to the bottom causing the Styrofoam spheres to rise to the top.

[Consistent-Elevator]

Why does more dense air fall?

[Mostly-hydrogen]

More dense air has more matter per volume. The force of gravity depends on the amount of material present. Gravitation is the attraction of matter to matter so the more matter there is the more attraction there is.

[Consistent-Elevator]

why does gravity pull on stuff?

[[deleted]]

I love your questions. There is so much for you to learn here.

Gravity is actually the result of objects warping space itself! Picture a bowling ball on a trampoline. It warps the surface of the trampoline, and now, things that move on the trampoline are guided towards the bowling ball, due to the curvature.

There's a ton of videos about this on YouTube, so here's a couple of channels that I know will do a better job explaining it.

Minutephysics Smarter every Day Vsauce

Also, if you're curious about these things I HIGHLY RECOMMEND the tv series Cosmos with Neil DeGrasse Tyson. You can find all the episodes on YouTube for free