Status Updates From Seven Brief Lessons on Physics

It is not impossible for a hot body to become hotter through contact with a colder one: it is just extremely improbable.

it is statistically more probable that a quickly moving atom of the hot substance collides with a cold one and leaves it a little of its energy, rather than vice versa. Energy is conserved in the collisions but tends to get distributed in more or less equal parts when there are many collisions. In this way the temperature of objects in contact with each other tends to equalize.

“The difference between past and future exists only when there is heat. The fundamental phenomenon that distinguishes the future from the past is the fact that heat passes from things that are hotter to things that are colder.”

Seven Brief Lessons on Physics: Thoughts

Perhaps you too know very little about physics. Then again, we may be in the majority. This little book by Carlo Rovelli will not make you a master of physics. It will help you understand a little of the how and whys of the world and beyond....

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