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March 18th, 2017, 04:25 AM   #1
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Equilibrium

What is the SI unit of Equilibrium?
Is Equilibrium scalar or vector quantity?
Can we define laws of Equilibrium similar to law of inertia or Newton's laws of motion?

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Prashant S Akerkar
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March 18th, 2017, 04:34 AM   #2
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Equilibrium is a state, not a property.
Properties have units or dimensions.

Neither is it a 'quantity' and therefore not a vector or scalar.

Yes there are laws of equilibrium but it is a good idea to understand what equilibrium is before you look at these laws.

When some property of a system or body does not change with time it is said to be in a state of equilibrium with respect to that property.

So if a building continues to stand up it is in a state of mechanical equilibrium or force equilibrium.
If the temperature of a body does not change it is said to be in a state of thermal equilibrium.
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March 20th, 2017, 02:26 AM   #3
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Equilibrium is just the name for any system that doesn't change with time. They are often caused by the competition of at least two things (like forces, energy exchanges, momentum exchanges, etc.).

Stable equilibrium is the name for a system that doesn't change with time and is unaffected by small perturbations. For example, consider a peanut in a bowl. The equilibrium state is the peanut being at the bottom of the bowl. If you push the peanut a little bit, it will change its position a bit, but it will always go back to the bottom of the bowl. The only way to destroy the equilibrium is to push the peanut so hard that the peanut leaves the bowl.

Unstable equilibrium is the name for a system that doesn't change, but the slightest perturbation will destroy the equilibrium. For example, consider a peanut on top of a smooth ball. Even the slightest nudge will cause the peanut to fall from the top.
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