20 MPa to atm — 20 megapascals in standard atmospheres
Exact 20 × 9.869233 = 197.384653
20 megapascals in other units
| Pascals | 20,000,000 | Pa |
|---|---|---|
| Hectopascals | 200,000 | hPa |
| Kilopascals | 20,000 | kPa |
| Millibars | 200,000 | mbar |
| Bar | 200 | bar |
| Standard atmospheres | 197.384653 | atm |
| Pounds per square inch | 2,900.75 | psi |
| Torr | 150,012.34 | Torr |
| Millimetres of mercury | 150,012.32 | mmHg |
| Inches of mercury | 5,906 | inHg |
MPa to atm at a glance
| Megapascals | Standard atmospheres |
|---|---|
| 1 MPa | 9.869233 atm |
| 2 MPa | 19.738465 atm |
| 3 MPa | 29.607698 atm |
| 5 MPa | 49.346163 atm |
| 10 MPa | 98.692327 atm |
| 20 MPa | 197.384653 atm |
| 25 MPa | 246.730817 atm |
| 50 MPa | 493.461633 atm |
| 100 MPa | 986.923267 atm |
| 250 MPa | 2,467.31 atm |
| 500 MPa | 4,934.62 atm |
| 1,000 MPa | 9,869.23 atm |
How to convert megapascals to standard atmospheres
Multiply by 9.869233 — one megapascal is 9.869233 standard atmospheres. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 20 × 9.869233 = 197.384653
In words: about one hundred ninety-seven standard atmospheres.
Questions
How many standard atmospheres are in a megapascal?
One megapascal is 9.869233 standard atmospheres. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 20 megapascals in standard atmospheres?
20 megapascals is 197.384653 standard atmospheres. The working is 20 × 9.869233 = 197.384653.
What pressure should my tyres be?
Look at the sticker in the driver's door frame or the fuel flap, not the number moulded into the tyre — that one is the tyre's maximum, not the manufacturer's recommendation. Most cars sit somewhere around 32 to 35 psi, which is roughly 2.2 to 2.4 bar.
Is my tyre gauge measuring absolute or gauge pressure?
Gauge pressure — the amount above the surrounding air. A tyre reading 32 psi actually contains about 46.7 psi absolute, because atmospheric pressure of roughly 14.7 psi is already pressing on the other side of the gauge. Conversions on this page are between units, and leave that distinction alone.
Why do weather forecasts use hectopascals and millibars interchangeably?
Because they are the same size. One hectopascal is exactly one millibar, so the change from mbar to hPa was a relabelling rather than a conversion. Standard sea-level pressure is 1013.25 of either.
What is the difference between torr and mmHg?
Almost nothing, and the difference is deliberate. A torr is exactly one seven-hundred-and-sixtieth of a standard atmosphere; the conventional mmHg is defined as exactly 133.322387415 pascals. They diverge by about one part in seven million — invisible in medicine, occasionally not in vacuum work.