Difference Between Bar and Pascals

Bar vs Pascals

Bar and pascal are two units used in measurement of pressure. These units are used in fields such as chemistry, industries, physics, meteorology, weather forecasting, cardiology, and even diving. A proper understanding in these units is required in order to excel in such fields. In this article, we are going to discuss what bar and pascal are, their definitions, the similarities between the bar and pascal, the systems and common places these units are used and finally the difference between the bar and pascal.


The unit pascal is used to measure pressure. Pascal is denoted by the term “Pa”. In understanding the concepts of the unit pascal, one must first understand pressure. Pressure is defined as the force per unit area applied in a direction perpendicular to the object. The pressure of a static fluid is equal to the weight of the fluid column above the point the pressure is measured. Therefore, the pressure of a static (non-flowing) fluid is dependent only on the density of the fluid, the gravitational acceleration, the atmospheric pressure and the height of the liquid above the point the pressure is measured. The pressure can also be defined as the force exerted by the collisions of particles. In this sense, the pressure can be calculated using the molecular kinetic theory of gasses and the gas equation. The unit pascal is defined as the pressure created by a force of one newton acting over an area on one square meter. The pascal is the SI unit of pressure measurement. It is used to measure stress, Young’s modulus and tensile strength apart from the more commonly known pressure measurement. The unit pascal is named after the French physicist, mathematician, writer, philosopher and inventor Blaise Pascal. Pascal is a very small unit compared to the pressures that we experience daily. The atmospheric pressure at the sea level is about 100 Pa.


Bar is also a unit that is used to measure pressure. Bar is neither a SI unit nor a cgs unit. However, bar is accepted in many countries as a measurement of pressure. One bar is defined as 100 kilopascals. This means 1 bar is equal to 10000 pascals. The pressure at the mean sea level is also approximately this value. Therefore, bar is a very useful unit in measuring atmospheric pressures. The atmospheric pressure is 101.325 kilopascals to be precise. Since 1 bar is equal to 100 kilopascals, the fractional error between these two are smaller than 1%. Therefore, for most of the cases bar is taken as the atmospheric pressure. Bar is the common pressure measurement used in fields such as meteorology and weather forecasting. Apart from the basic unit bar, units such as millibar and decibar also exist.


What is the difference between Pascal and Bar?

• Pascal is a standard SI unit while bar is not.

• Bar is widely used as a practical unit, and it is famous on fields such as weather forecasting. Pascal is the standard unit, and it is used in researches and scientific documents.