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Vacuum

µm Hgtoatm

Convert microns of mercury (µm Hg) to standard atmospheres (vacuum) (atm).

Factor1 µm Hg = 1.315789e-6 atm

Converter

µm Hg

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1atm

Rendered to 6 significant figures.

Formula

Formula
atm = µm Hg × 1.315789e-6

Multiply any value in microns of mercury by 1.315789e-6 to obtain the value in standard atmospheres (vacuum).

Worked example

Convert 760000 µm Hg to atm.

  1. 01Start with 760000 µm Hg.
  2. 02Multiply by the conversion factor: 760000 × 1.315789e-6 = 1 atm.
Result760000 µm Hg = 1 atm

Conversion table

µm Hgatm
11.3158e-6
22.6316e-6
56.5789e-6
101.3158e-5
202.6316e-5
506.5789e-5
1000.00013158
2000.00026316
5000.00065789
10000.0013158

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from µm Hg to atm?
1 µm Hg equals 1.315789e-6 atm. To convert, multiply the value in microns of mercury by 1.315789e-6.
How do I convert 1 µm Hg to atm?
1 µm Hg = 1.31579e-6 atm. For any value, multiply by 1.315789e-6.
How do I convert atm back to µm Hg?
Divide by the same factor — or equivalently, multiply by 760000. So 1 atm = 760000 µm Hg.
When would I need to convert micron of mercury to standard atmosphere (vacuum)?
Vacuum-pressure conversions between µm Hg and atm are common in vacuum-chamber instrumentation, pump-down endpoint specification, semiconductor and deposition process work, freeze-drying, electron-microscopy column pressure, vacuum metallurgy and HVAC / refrigeration service. Torr, mmHg and inHg dominate manometric vacuum gauges; mbar is standard on European instruments; micron Hg and mTorr cover high-vacuum work; Pa and kPa are the SI references. This category is vacuum / instrumentation intent — dimensionally the same as pressure, but kept separate so process-pressure searches and vacuum searches stay on the right page.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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