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Vacuum

mTorrtommHg

Convert millitorr (mTorr) to millimetres of mercury (vacuum) (mmHg).

Factor1 mTorr = 0.0009999999 mmHg

Converter

mTorr

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

Result
1mmHg

Rendered to 6 significant figures.

Formula

Formula
mmHg = mTorr × 0.0009999999

Multiply any value in millitorr by 0.0009999999 to obtain the value in millimetres of mercury (vacuum).

Worked example

Convert 1000 mTorr to mmHg.

  1. 01Start with 1000 mTorr.
  2. 02Multiply by the conversion factor: 1000 × 0.0009999999 = 1 mmHg.
Result1000 mTorr = 1 mmHg

Conversion table

mTorrmmHg
10.001
20.002
50.005
100.01
200.02
500.05
1000.1
2000.2
5000.5
10001

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mTorr to mmHg?
1 mTorr equals 0.0009999999 mmHg. To convert, multiply the value in millitorr by 0.0009999999.
How do I convert 1 mTorr to mmHg?
1 mTorr = 0.001 mmHg. For any value, multiply by 0.0009999999.
How do I convert mmHg back to mTorr?
Divide by the same factor — or equivalently, multiply by 1000. So 1 mmHg = 1000 mTorr.
When would I need to convert millitorr to millimetre of mercury (vacuum)?
Vacuum-pressure conversions between mTorr and mmHg 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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