Q: Does "mercury" have the same meaning in the following two sentences?

The mercury was falling rapidly.

The mercury there has averaged 37.6C, 2.3C above the February norm.

A: the same meaning

Q: Does "reversal" have the same meaning in the following two sentences?

There was a reversal of autonomic function.

The reversal of the image in the lens.

A: different meanings

Q: Does "keep" have the same meaning in the following two sentences?

Keep food for a week in the pantry.

She never keeps her promises.

A:
different meanings