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Vacuum

atmtoµm Hg

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

Factor1 atm = 760000 µm Hg

Converter

atm

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

Result
760000µm Hg

Rendered to 6 significant figures.

Formula

Formula
µm Hg = atm × 760000

Multiply any value in standard atmospheres (vacuum) by 760000 to obtain the value in microns of mercury.

Worked example

Convert 1 atm to µm Hg.

  1. 01Start with 1 atm.
  2. 02Multiply by the conversion factor: 1 × 760000 = 760000 µm Hg.
Result1 atm = 760000 µm Hg

Conversion table

atmµm Hg
17.6000e+5
21.5200e+6
53.8000e+6
107.6000e+6
201.52e+7
503.8e+7
1007.6e+7
2001.52e+8
5003.8e+8
10007.6e+8

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from atm to µm Hg?
1 atm equals 760000 µm Hg. To convert, multiply the value in standard atmospheres (vacuum) by 760000.
How do I convert 1 atm to µm Hg?
1 atm = 760000 µm Hg. For any value, multiply by 760000.
How do I convert µm Hg back to atm?
Divide by the same factor — or equivalently, multiply by 1.315789e-6. So 1 µm Hg = 1.31579e-6 atm.
When would I need to convert standard atmosphere (vacuum) to micron of mercury?
Vacuum-pressure conversions between atm and µm Hg 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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