key term - Bar

Definition

A bar is a unit of pressure defined as 100,000 Pascals. It is commonly used in scientific contexts to measure atmospheric and gas pressures.

5 Must Know Facts For Your Next Test

1. 1 bar is equivalent to 100,000 Pascals (Pa) or 0.1 Megapascals (MPa).
2. Standard atmospheric pressure at sea level is approximately 1.01325 bars.
3. Bars are often used in meteorology and oceanography to describe pressures.
4. Pressure measurements in bars can be converted to other units such as atmospheres (atm) or Torr.
5. In the context of gas laws, understanding pressure in bars helps solve problems involving Boyle's Law, Charles's Law, and the Ideal Gas Law.

Review Questions

Related terms

Atmosphere (atm): A unit of pressure defined as being precisely equal to the average atmospheric pressure at sea level, approximately equal to 101,325 Pascals.

Pascal (Pa): The SI unit for measuring pressure; one Pascal is equal to one Newton per square meter.

$Torr$: $A$ unit of pressure where $1 \ Torr = \frac{1}{760} \ atm$, roughly equivalent to the millimeter of mercury $(mmHg)$.