What is the Difference Between Bar and Barg?
🆚 Go to Comparative Table 🆚The difference between "bar" and "barg" lies in the type of pressure they represent. "Bar" is the unit of measurement used to measure absolute pressure, while "barg" is the unit for the measurement of gauge pressure.
- Absolute Pressure: This is the measurement taken against a perfect vacuum, using an absolute scale. It is the most technically correct value and is commonly signified by "bara" or "psia".
- Gauge Pressure: This is measured against ambient air pressure. It is equal to absolute pressure minus atmospheric pressure and is generally signified by "barg" and "psig" (or "bare" and "psie"). Gauge pressure is the most commonly used pressure reference because it uses the atmospheric pressure as a reference point.
In summary, the key difference between "bar" and "barg" is that "bar" indicates absolute pressure, whereas "barg" indicates gauge pressure. When measuring pressure, it is essential to choose the correct reference (absolute or gauge) to ensure accurate measurements.
Comparative Table: Bar vs Barg
The key difference between "bar" and "barg" lies in the type of pressure they represent. Here is a comparison table detailing the differences:
| Term | Definition | Description |
|---|---|---|
| Bar | Absolute pressure measurement | Indicates absolute pressure, which is measured against a perfect vacuum. It does not come under the SI unit system. |
| Barg | Gauge pressure measurement | Indicates gauge pressure, which is measured against ambient air pressure. |
Bar and barg are both units of pressure measurement, but they represent different types of pressure. Absolute pressure (bar) is measured against a perfect vacuum, while gauge pressure (barg) is measured against ambient air pressure.