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### What the role of classical equation of motion in quantum field theory?

I've learnt quantum field theory for a semester but I still can't understand the role of classical equation of motion in QFT. I have looked up for several books. They all discuss classical field ...
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### Why don't we use momentum to quantify inertia?

My understanding of Newton's 1st and 2nd laws have led me to believe that inertia and momentum are the same. 1st law: An external force is required to overcome an object's inertia 2nd law: Force is ...
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### Difficulty understanding molar volume

Suppose I am at STP and I am dealing with an ideal gas and I have a 22.4L container (with a movable piston attached on top) filled with 1 mol gas. Now, I will try to change the molar volume in two ...
13 views

### EPR Bohm's variant question

I've been doing some research on the EPR paradox and there is an instance that I do not understand. Say we have a positron electron pair that are entangled, conservation of angular momentum tells us ...