Hectopascals to Atmospheres (hPa → atm)
Formula
1 hPa = 0.0009869232667160128 atmConversion Table
| hPa | atm |
|---|---|
| 0 | 0 |
| 1.0000 | 0.00098692 |
| 2.0000 | 0.0019738 |
| 3.0000 | 0.0029608 |
| 4.0000 | 0.0039477 |
| 5.0000 | 0.0049346 |
| 6.0000 | 0.0059215 |
| 7.0000 | 0.0069085 |
| 8.0000 | 0.0078954 |
| 9.0000 | 0.0088823 |
| 10.000 | 0.0098692 |
| 11.000 | 0.010856 |
| 12.000 | 0.011843 |
| 13.000 | 0.012830 |
| 14.000 | 0.013817 |
| 15.000 | 0.014804 |
| 16.000 | 0.015791 |
| 17.000 | 0.016778 |
| 18.000 | 0.017765 |
| 19.000 | 0.018752 |
| hPa | atm |
|---|---|
| 20.000 | 0.019738 |
| 21.000 | 0.020725 |
| 22.000 | 0.021712 |
| 23.000 | 0.022699 |
| 24.000 | 0.023686 |
| 25.000 | 0.024673 |
| 26.000 | 0.025660 |
| 27.000 | 0.026647 |
| 28.000 | 0.027634 |
| 29.000 | 0.028621 |
| 30.000 | 0.029608 |
| 31.000 | 0.030595 |
| 32.000 | 0.031582 |
| 33.000 | 0.032568 |
| 34.000 | 0.033555 |
| 35.000 | 0.034542 |
| 36.000 | 0.035529 |
| 37.000 | 0.036516 |
| 38.000 | 0.037503 |
| 39.000 | 0.038490 |
| hPa | atm |
|---|---|
| 40.000 | 0.039477 |
| 41.000 | 0.040464 |
| 42.000 | 0.041451 |
| 43.000 | 0.042438 |
| 44.000 | 0.043425 |
| 45.000 | 0.044412 |
| 46.000 | 0.045398 |
| 47.000 | 0.046385 |
| 48.000 | 0.047372 |
| 49.000 | 0.048359 |
| 50.000 | 0.049346 |
| 51.000 | 0.050333 |
| 52.000 | 0.051320 |
| 53.000 | 0.052307 |
| 54.000 | 0.053294 |
| 55.000 | 0.054281 |
| 56.000 | 0.055268 |
| 57.000 | 0.056255 |
| 58.000 | 0.057242 |
| 59.000 | 0.058228 |
| hPa | atm |
|---|---|
| 60.000 | 0.059215 |
| 61.000 | 0.060202 |
| 62.000 | 0.061189 |
| 63.000 | 0.062176 |
| 64.000 | 0.063163 |
| 65.000 | 0.064150 |
| 66.000 | 0.065137 |
| 67.000 | 0.066124 |
| 68.000 | 0.067111 |
| 69.000 | 0.068098 |
| 70.000 | 0.069085 |
| 71.000 | 0.070072 |
| 72.000 | 0.071058 |
| 73.000 | 0.072045 |
| 74.000 | 0.073032 |
| 75.000 | 0.074019 |
| 76.000 | 0.075006 |
| 77.000 | 0.075993 |
| 78.000 | 0.076980 |
| 79.000 | 0.077967 |
Hectopascals to Atmospheres Conversion
Converting Hectopascals (hPa) to Atmospheres (atm) is a common pressure conversion. 1 hPa equals 0.000987 atm. For example, 100 hPa is equal to 0.098692 atm.
Quick Mental Math: Hectopascals to Atmospheres
Pressure units (atm, bar, psi, pascal) are diverse; use atmospheres as a reference tier.
Why is converting Hectopascals to Atmospheres tricky?
Magnitude or direction confusion between hectopascals and atmospheres is the primary error source.
Quick Reference Values
1 hPa = 0.000987 atm. 5 hPa = 0.004935 atm. 10 hPa = 0.009869 atm. 25 hPa = 0.024673 atm. 50 hPa = 0.049346 atm. 100 hPa = 0.098692 atm.
What is Hectopascals?
Hectopascals (hPa) is a unit of pressure. The hectopascal is a unit of pressure equal to 100 pascals. It is defined as exactly 100 newtons per square meter (100 N/m²), where the pascal (Pa) is the SI derived unit of pressure. The hectopascal is widely used in meteorology for atmospheric pressure measurements and aligns with the SI system as per international standards [bipm-si-brochure]. The pascal unit was named after Blaise Pascal and officially adopted by the General Conference on Weights and Measures (CGPM) in 1971. The hectopascal emerged as a convenient multiple used in meteorology to represent atmospheric pressure values in the 20th century [cgpm-resolutions]. Hectopascals are standard in weather reports worldwide, especially in Europe, Asia, and Australia. The US National Weather Service uses millibars, numerically equivalent to hectopascals, for atmospheric pressure. It is recognized by ISO 80000 as a unit of pressure [iso-80000].
What is Atmospheres?
Atmospheres (atm) is a unit of pressure. One atmosphere (atm) is a unit of pressure defined as exactly 101,325 pascals (Pa). It approximates the average air pressure at sea level on Earth. The atmosphere unit is used for expressing pressures in meteorology and engineering [iso-80000]. The atmosphere was originally defined in the 19th century based on average sea-level air pressure. It was standardized by the International Union of Pure and Applied Chemistry (IUPAC) and other bodies to equal 101,325 Pa in the mid-20th century [nist-sp-811]. Atmospheres are used worldwide in scientific fields, including chemistry and physics, and in engineering applications like pressure vessel design. It is less common in everyday use outside these fields [nist-sp-811].
Common Misspellings
People often search for this conversion using these alternate spellings: hecto pascals, hecto-pascals, hecto pascal, hec topascal, atmosphers, atmosfere, atmospere, atmospherics. All of these refer to the Hectopascals to Atmospheres conversion.