Why do atoms and molecules move?

Answer 1

Due to energy ( momentum, inertia...)

Because they're free in gaseous or liquid solutions ( much less in a solid state).

They've got energy to spend (not lose) by motion; they gain energy, for example, by interacting with a magnetic field.

There are always forces of attraction between atoms and molecules.

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Answer 2

Atoms and molecules move due to thermal energy, which causes random motion known as Brownian motion.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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