I've been looking back at my physics textbook and looking through chapters that weren't covered. For the entire physics series, the topics of mechanics, electromagnetism, and waves and optics were covered.There's a chapter on fluids and elasticity, a section for thermodynamics, and another section of quantum physics that wasn't covered.
I'm currently going through the chapter on fluids and elasticity, and in this section I will have a better understanding on buoyancy. So far from what I've went over, I learned that pressure is force over area and the unit is a pascal (N/m^2). A fluid is a gas or liquid and it exerts a force by having atoms or molecules bounce on a surface in the case of gas or force due to gravity in the case of a liquid. You're typical air pressure at sea level is 101.3 kPa or 1 atm (standard atmosphere). We aren't crushed by air pressure because the fluid exerts a force in all directions so the net force is zero. A vacuum works because air pressure is removed from one area, and this creates a net force in a direction.
This is mostly by memory, so make a correction as always if you see an error. I find this very interesting. I wonder where this will show up for one of my required course for mechanical engineering. I know I'll see thermodynamics again in a course titled advanced thermodynamics.
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