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How does pressure affect chemical bonding?

The molecular theory of friction says that friction arises as a result of bonding between the suface molecules in contact… When we push a body, these bonds are stretched much like in a spring and that results in a force(kind of like restoring force) which we feel as friction… Now the theory says that the strength of these bonds depend on pressure… In a practical case the effective area of contact between the two surfaces is much much less than the actual surface area of the bottom… It very much depends on the sufaces in contact… That influences the value of $\mu$. So we generally do not talk about pressure but the weight(or better, the reaction force because it may happen that in some cases the action is more or maybe less than the weight due to some obvious reasons) of the body in contact… so is the equation… Fs=$\mu$R

So why does a stronger pressure mean a stronger bond?

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