Vacuum
µm HgtomTorr
Convert microns of mercury (µm Hg) to millitorr (mTorr).
Factor1 µm Hg = 1 mTorr
Converter
µm Hg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mTorr
Rendered to 6 significant figures.
Formula
Formula
mTorr = µm Hg × 1
Multiply any value in microns of mercury by 1 to obtain the value in millitorr.
Worked example
Convert 1000 µm Hg to mTorr.
- 01Start with 1000 µm Hg.
- 02Multiply by the conversion factor: 1000 × 1 = 1000 mTorr.
Result1000 µm Hg = 1000 mTorr
Conversion table
| µm Hg | mTorr |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 5 | 5 |
| 10 | 10 |
| 20 | 20 |
| 50 | 50 |
| 100 | 100 |
| 200 | 200 |
| 500 | 500 |
| 1000 | 1000 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from µm Hg to mTorr?
1 µm Hg equals 1 mTorr. To convert, multiply the value in microns of mercury by 1.
How do I convert 1 µm Hg to mTorr?
1 µm Hg = 1 mTorr. For any value, multiply by 1.
How do I convert mTorr back to µm Hg?
Divide by the same factor — or equivalently, multiply by 1. So 1 mTorr = 1 µm Hg.
When would I need to convert micron of mercury to millitorr?
Vacuum-pressure conversions between µm Hg and mTorr 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).