Question

Which unit of pressure is derived from the early barometers used to measure pressure?

Answer 1

atmospheres (atm) or bars

Step-by-step explanation:

You did not give options but barometers measure pressure in atmospheres (atm) or bars.

Between atm or bars, pick one that is in your choices.

Answer 2

mmHg

Step-by-step explanation:

Early barometers used mercury (Hg) to measure pressure based on how high or low it went against the ruler (mm).