what is pressure?

Question

I was thinking today about how everything in the universe works according to pressure--from our bodily functions like breathing, to our cars, to outerspace--but I couldn't remember the definition for what pressure is exactly, or what causes it. can pressure exist where nothing is? would that be a vaccum, meaning there is no pressure? so does substance create pressure? why does moving air have less pressure than stagnant air?

What is force and where does it come from?

Answer 1

For starters, pressure is the force per unit area acting on a body.