두 단위가 모두 정확하게 정의되어 있지만 변환된 값은 순환소수이므로 유효숫자 12자리로 표시합니다.
압력 단위 변환기 소개
Each pressure unit is a fixed number of pascals (newtons per square metre). The bar is exactly 100,000 Pa, the standard atmosphere 101,325 Pa and the torr 1/760 atm. The psi, one pound-force per square inch, is about 6,894.757 Pa, fixed exactly by the 1959 pound, standard gravity (9.80665 m/s²) and the 25.4 mm inch.
The default converts a 32 psi tyre pressure to 2.2063 bar. Weather maps use hectopascals (1 hPa = 1 mbar; standard sea-level pressure is 1,013.25 hPa), and blood pressure is recorded in millimetres of mercury.
Gauge and absolute readings convert with the same factor but are not interchangeable: a tyre gauge shows pressure above the surrounding air, so 32 psi on the gauge is about 46.7 psi absolute at sea level. The inch of mercury uses the conventional value at 0 °C and is marked approximate.
계산 예제
32 psi tyre pressure in bar
값
32 psi
변환 전
pound per square inch (psi)
변환 후
바
변환된 값
2.2063223338 bar
검증 출처: 1 psi = 4.4482216152605 N ÷ (0.0254 m)² (NIST SP 811 App. B); 32 psi = 8896443230521/4032250000000 bar (Python 3.8 fractions from the legal definitions)
1 atm in psi
값
1 atm
변환 전
standard atmosphere (atm)
변환 후
pound per square inch (psi)
변환된 값
14.6959487755 psi
검증 출처: 101325 Pa ÷ 6894.757293168… Pa (Python 3.8 fractions from the legal definitions)
760 torr is 1 atm
값
760 Torr
변환 전
torr (Torr)
변환 후
standard atmosphere (atm)
변환된 값
1 atm
정확성
정확함
검증 출처: 1 torr = 101325/760 Pa by definition (NIST SP 811 App. B)
1 inHg (conventional value)
값
1 inHg
변환 전
inch of mercury (inHg)
변환 후
pascal (Pa)
변환된 값
3,386.389 Pa
정확성
근삿값
검증 출처: NIST SP 811 App. B.9: inch of mercury (0 °C) = 3.386389 E+03 Pa
자주 묻는 질문
How do I convert psi to bar?
Divide by 14.5038, or multiply by 0.0689476. A bar is 100,000 Pa and a psi 6,894.757 Pa, so 1 bar = 14.5038 psi. A 32 psi tyre is 2.2063 bar, and a 2.5 bar tyre is 36.26 psi.
Is 1 bar the same as 1 atmosphere?
No, though they are within 1.3%. The bar is exactly 100,000 Pa, while the standard atmosphere is exactly 101,325 Pa, which is 1.01325 bar, 14.696 psi or 760 mmHg. The atmosphere was set to match average sea-level air pressure, which is why weather charts centre on 1,013.25 hPa.
What is the difference between psig and psia?
psig is gauge pressure, measured relative to the surrounding air; psia is absolute pressure, measured from a vacuum. At sea level psia = psig + 14.696. Tyre and compressor gauges read psig, so a flat tyre shows 0 psig while still holding 14.7 psia of air. The converter treats both alike, so keep input and output the same kind.
Are mmHg and torr the same?
Almost. A torr is exactly 1/760 of a standard atmosphere, 133.322368 Pa, while the conventional millimetre of mercury is 133.322387415 Pa; they differ by about 0.14 parts per million. For blood pressure the difference never matters: 120/80 mmHg is 16.0/10.7 kPa either way.
How do I convert inches of mercury to hPa?
Multiply by 33.8639: 29.92 inHg is 1,013.2 hPa, the standard altimeter setting in US aviation. This converter uses the conventional inch of mercury at 0 °C, 3,386.389 Pa (NIST SP 811), and marks results that use it as approximate because mercury's density changes with temperature.
“압력 단위 변환기”의 정확도는 어느 정도인가요?
정확도는 입력값과 계산 방법의 가정에 따라 달라집니다. 십진 연산은 유효숫자 50자리를 사용하지만, 추정값·수치해석 방법·원본 데이터의 정밀도는 더 낮을 수 있습니다. 표시값을 반올림해도 이러한 한계는 사라지지 않습니다. 독립적인 출처의 풀이와 대조한 계산 예시: 4. 예를 들어 “32 psi tyre pressure in bar”은 1 psi = 4.4482216152605 N ÷ (0.0254 m)² (NIST SP 811 App. B); 32 psi = 8896443230521/4032250000000 bar (Python 3.8 fractions from the legal definitions)와 대조해 확인합니다.
이 계산 방법의 출처는 무엇인가요?
NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors; NIST Handbook 44, Appendix C — General tables of units of measurement.
이 계산기 소개
xto=xfrom×ftoffromf=one unit expressed in Pa