Understanding milliteslas to milligauss Conversion
The millitesla (mT) is an SI subunit of the tesla, while the milligauss (mG) is one-thousandth of the CGS gauss. Because 1 tesla equals 10,000 gauss, one millitesla equals 10,000 milligauss. This large factor makes the conversion useful when moderate SI fields are expressed on the very fine milligauss scale used in EMF surveys and geomagnetic monitoring, where readings are often only a few milligauss.
Conversion Formula
To convert milliteslas to milligauss, multiply by this factor:
Step-by-Step Example
Convert 25 milliteslas to milligauss.
How to Convert milliteslas to milligauss
Converting the SI millitesla to the fine CGS milligauss uses a large fixed factor.
- Take the field in milliteslas: For example, 25 mT.
- Multiply by 10,000: Each millitesla equals 10,000 milligauss.
- Report in milligauss: The result suits EMF and geomagnetic survey conventions.
- Worked result: 25 mT × 10,000 = 250,000 mG.
milliteslas to milligauss conversion table
| milliteslas (mT) | milligauss (mG) |
|---|---|
| 0 | 0 |
| 1 | 10000 |
| 2 | 20000 |
| 3 | 30000 |
| 4 | 40000 |
| 5 | 50000 |
| 6 | 60000 |
| 7 | 70000 |
| 8 | 80000 |
| 9 | 90000 |
| 10 | 100000 |
| 15 | 150000 |
| 20 | 200000 |
| 25 | 250000 |
| 30 | 300000 |
| 40 | 400000 |
| 50 | 500000 |
| 60 | 600000 |
| 70 | 700000 |
| 80 | 800000 |
| 90 | 900000 |
| 100 | 1000000 |
| 150 | 1500000 |
| 200 | 2000000 |
| 250 | 2500000 |
| 300 | 3000000 |
| 400 | 4000000 |
| 500 | 5000000 |
| 600 | 6000000 |
| 700 | 7000000 |
| 800 | 8000000 |
| 900 | 9000000 |
| 1000 | 10000000 |
| 2000 | 20000000 |
| 3000 | 30000000 |
| 4000 | 40000000 |
| 5000 | 50000000 |
| 10000 | 100000000 |
| 25000 | 250000000 |
| 50000 | 500000000 |
| 100000 | 1000000000 |
| 250000 | 2500000000 |
| 500000 | 5000000000 |
| 1000000 | 10000000000 |
What is the Millitesla?
The millitesla is a decimal submultiple of the tesla, the SI unit of magnetic flux density. It is a convenient scale for describing moderately strong magnetic fields such as those near permanent magnets and small electromagnets.
Definition
One millitesla is one thousandth of a tesla.
In SI base units, . Because one gauss equals tesla, one millitesla equals exactly 10 gauss, a relation that makes the millitesla especially handy when translating between SI and legacy CGS field measurements.
Origin and History
The millitesla inherits its name from Nikola Tesla via the tesla, adopted into the SI in 1960, combined with the standard SI prefix "milli" (one thousandth), introduced in the metric system's prefix scheme. It became a practical working unit as magnetic measurements standardized on SI in the later 20th century.
Law and Notable Facts
As a coherent SI submultiple, the millitesla is fully sanctioned for scientific and engineering use. Many benchtop laboratory magnets, magnetic separators, and material-testing fields fall naturally in the tens-to-hundreds of millitesla range, bridging the gap between weak ambient fields and the multi-tesla fields of MRI or research magnets.
Real-World Examples and Conversions
- A small solenoid or relay coil field is often a few millitesla.
- A typical hard-disk or speaker magnet produces a few hundred millitesla near its poles.
- Earth's field of about 50 microtesla equals 0.05 mT.
- 1 mT = 0.001 T = 10 gauss = 1000 microtesla.
What is the milligauss?
The milligauss is a small unit of magnetic flux density (magnetic field strength) equal to one-thousandth of a gauss. It is widely used in geomagnetism, environmental EMF measurements, and consumer magnetometer readings.
Definition
One milligauss is 10⁻³ gauss, and since the gauss is defined as 10⁻⁴ tesla, the milligauss equals 10⁻⁷ tesla in SI units:
The gauss is the CGS-Gaussian unit of magnetic flux density, defined as one maxwell per square centimetre. The SI coherent unit is the tesla (1 T = 1 Wb/m²), so 1 G = 100 µT and 1 mG = 100 nT = 0.1 µT.
Origin and History
The gauss is named after the German mathematician and physicist Carl Friedrich Gauss (1777–1855), a pioneer of geomagnetic measurement who, with Wilhelm Weber, established absolute magnetic units. The milligauss arose naturally as a convenient submultiple for the weak fields encountered in everyday and geophysical work.
Law and Notable Facts
The gauss and milligauss are not SI units; the SI officially uses the tesla. Nonetheless the milligauss remains standard in the EMF-measurement and geomagnetism communities. The Earth's magnetic field is a familiar reference: it ranges from roughly 250 to 650 mG over the surface.
Real-World Examples and Conversions
- Earth's surface magnetic field: about 250–650 mG (25–65 µT).
- A typical household appliance at 30 cm distance: a few mG to tens of mG.
- 1000 mG = 1 gauss = 100 µT = 0.0001 T.
- A refrigerator magnet at its surface: roughly 100–500 G, i.e. 100,000–500,000 mG.
Frequently Asked Questions
How many milligauss are in a millitesla?
One millitesla equals 10,000 milligauss, because 1 mT is 10 gauss and each gauss is 1000 milligauss.
Where is the milligauss unit used?
EMF safety surveys and geomagnetic instruments often report in milligauss, so SI field readings in mT are scaled up by 10,000 to match.
What household EMF level is considered notable?
Home EMF readings are often just a few milligauss, so even a small mT value corresponds to a large milligauss number.
How do I convert 0.5 milliteslas to milligauss?
Multiply 0.5 by 10,000 to get 5000 mG.
Why is the conversion factor so large?
The millitesla is a fairly strong field unit while the milligauss is very small, so their ratio is 10,000 to 1.
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Complete milliteslas conversion table
| Unit | Result |
|---|---|
| teslas (T) | 0.001 T |
| microteslas (uT) | 1000 uT |
| gauss (G) | 10 G |
| milligauss (mG) | 10000 mG |