Bar to Pascal Converter
Accurate pressure unit conversion for engineering and scientific applications
Pressure Converter
Conversion Result
Popular Bar to Pascal Conversions
These commonly used pressure conversions provide quick reference values for engineering, meteorology, and scientific applications.
| Bar (bar) | Pascal (Pa) | Kilopascal (kPa) | Megapascal (MPa) |
|---|---|---|---|
| 0.01 | 1,000 | 1 | 0.001 |
| 0.1 | 10,000 | 10 | 0.01 |
| 0.5 | 50,000 | 50 | 0.05 |
| 1 | 100,000 | 100 | 0.1 |
| 1.5 | 150,000 | 150 | 0.15 |
| 2 | 200,000 | 200 | 0.2 |
| 3 | 300,000 | 300 | 0.3 |
| 5 | 500,000 | 500 | 0.5 |
| 10 | 1,000,000 | 1,000 | 1 |
| 20 | 2,000,000 | 2,000 | 2 |
| 50 | 5,000,000 | 5,000 | 5 |
| 100 | 10,000,000 | 10,000 | 10 |
Conversion Formula and Steps
Bar to Pascal Formula:
Pa = bar × 100,000
Pascal to Bar Formula:
bar = Pa ÷ 100,000
Step-by-Step Conversion Process
- Identify your starting unit: Determine whether you’re converting from bar to pascal or pascal to bar.
- Apply the conversion factor: One bar equals exactly 100,000 pascals. This relationship is fixed and internationally standardised.
- Perform the maths: For bar to pascal, multiply your bar value by 100,000. For pascal to bar, divide your pascal value by 100,000.
- Round appropriately: Depending on your application, round to the appropriate number of significant figures or decimal places.
- Verify your result: Check that your answer makes sense. Pascals should always be a larger number than the equivalent bar value since pascal is a smaller unit.
Worked Examples
Example 1: Convert 2.5 bar to pascals
2.5 bar × 100,000 = 250,000 Pa
Example 2: Convert 750,000 Pa to bar
750,000 Pa ÷ 100,000 = 7.5 bar
Example 3: Convert 0.2 bar to kilopascals
0.2 bar × 100,000 = 20,000 Pa = 20 kPa
Bar vs Pascal: Key Differences
Pascal (Pa)
- SI unit of pressure
- Defined as one newton per square metre (N/m²)
- Named after Blaise Pascal
- Smaller unit, suitable for low pressures
- Commonly used in physics and scientific research
- Often expressed as kilopascals (kPa) or megapascals (MPa) for practicality
Bar
- Metric unit of pressure
- Equal to 100,000 pascals exactly
- Approximately equals atmospheric pressure at sea level
- Larger unit, convenient for industrial applications
- Widely used in engineering and meteorology
- Common in hydraulic systems, tyre pressure, and weather forecasting
Important Note: Whilst bar is not an SI unit, it’s widely accepted and used internationally due to its convenient size. One bar is approximately equal to atmospheric pressure at sea level (1 bar ≈ 0.987 atm).
Common Pressure Values in Context
| Application | Typical Pressure (bar) | Equivalent (Pa) |
|---|---|---|
| Atmospheric pressure at sea level | 1.013 | 101,300 |
| Car tyre pressure | 2.0 – 2.5 | 200,000 – 250,000 |
| Bicycle tyre pressure (road bike) | 6 – 8 | 600,000 – 800,000 |
| Espresso machine | 9 – 10 | 900,000 – 1,000,000 |
| Pressure washer (domestic) | 100 – 150 | 10,000,000 – 15,000,000 |
| Hydraulic systems | 150 – 300 | 15,000,000 – 30,000,000 |
| Water supply (mains) | 3 – 5 | 300,000 – 500,000 |
| Scuba diving cylinder | 200 – 300 | 20,000,000 – 30,000,000 |
Related Pressure Unit Conversions
| From | To | Multiply By |
|---|---|---|
| 1 bar | Pascal (Pa) | 100,000 |
| 1 bar | Kilopascal (kPa) | 100 |
| 1 bar | Megapascal (MPa) | 0.1 |
| 1 bar | Atmosphere (atm) | 0.986923 |
| 1 bar | PSI (lb/in²) | 14.5038 |
| 1 bar | Millibar (mbar) | 1,000 |
| 1 bar | Torr (mmHg) | 750.062 |
Frequently Asked Questions
How many pascals are in one bar?
One bar equals exactly 100,000 pascals (Pa). This is a fixed conversion factor defined by international standards. The relationship can be expressed as 1 bar = 10⁵ Pa or 1 bar = 100 kPa.
Why is bar used instead of pascal in many industries?
Bar is often preferred in industrial applications because it represents a more convenient magnitude. Since one bar is approximately equal to atmospheric pressure at sea level, it provides intuitive reference points. For example, saying “2 bar” is simpler than “200,000 pascals” in everyday engineering contexts.
Is bar an SI unit?
No, bar is not an SI (International System of Units) unit. The SI unit for pressure is the pascal (Pa). However, bar is accepted for use alongside SI units and is widely employed in meteorology, engineering, and industrial applications due to its practical size.
How do I convert bar to kilopascals?
To convert bar to kilopascals (kPa), multiply the bar value by 100. Since 1 bar = 100,000 Pa and 1 kPa = 1,000 Pa, dividing gives us 1 bar = 100 kPa. For example, 3 bar = 300 kPa.
What is the difference between bar and millibar?
A millibar (mbar) is one-thousandth of a bar. Therefore, 1 bar = 1,000 mbar or 1 mbar = 0.001 bar. Millibars are commonly used in meteorology for reporting atmospheric pressure. Standard atmospheric pressure is approximately 1013 mbar.
Can I use this converter for tyre pressure?
Yes, this converter is suitable for tyre pressure conversions. Car tyres typically require 2.0-2.5 bar (200,000-250,000 Pa), whilst bicycle tyres vary widely depending on type. Many tyre pressure gauges display readings in bar, PSI, or kPa, so conversion between these units is often necessary.
What does “gauge pressure” versus “absolute pressure” mean?
Gauge pressure measures pressure relative to atmospheric pressure, whilst absolute pressure measures relative to a perfect vacuum. Most tyre pressure gauges and industrial pressure gauges show gauge pressure. Absolute pressure equals gauge pressure plus atmospheric pressure (approximately 1 bar at sea level).
How precise do my pressure conversions need to be?
Precision requirements depend on your application. For general engineering work, 2-3 decimal places usually suffice. Scientific research may require greater precision. Safety-critical applications like pressure vessel design demand high accuracy and should follow relevant British Standards and regulations.
References
- Bureau International des Poids et Mesures (BIPM). (2019). The International System of Units (SI), 9th edition. Paris: BIPM. ISBN 978-92-822-2272-0.
- British Standards Institution. (2009). BS EN 60079-0:2009 – Explosive atmospheres. Equipment. General requirements. London: BSI.
- National Physical Laboratory (NPL). (2021). Pressure Measurement. Teddington: NPL. Available at: www.npl.co.uk
- International Organization for Standardization. (2009). ISO 80000-4:2019 – Quantities and units — Part 4: Mechanics. Geneva: ISO.
- Thompson, A. and Taylor, B. N. (2008). Guide for the Use of the International System of Units (SI). NIST Special Publication 811. Gaithersburg: National Institute of Standards and Technology.