Understanding milligauss to teslas Conversion
The milligauss (mG) is a CGS unit of magnetic flux density equal to 10⁻³ gauss, while the tesla (T) is the SI unit, defined as one weber per square metre. Since one tesla equals 10,000 gauss, one milligauss equals 10⁻⁷ tesla. This conversion spans a wide range, linking the faint fields measured in EMF surveys to the powerful tesla-scale fields of MRI scanners and research magnets.
Conversion Formula
To convert milligauss to teslas, multiply by this factor:
Step-by-Step Example
Convert 25 milligauss to teslas.
How to Convert milligauss to teslas
Convert milligauss to teslas with one multiplication by the small SI factor.
- Note the field strength: Start with your value in milligauss, for example 25 mG.
- Multiply by the factor: Use 0.0000001 (10⁻⁷) tesla per milligauss.
- Compute: T.
- Express in scientific notation: 25 mG equals 2.5 × 10⁻⁶ tesla (2.5 microtesla).
milligauss to teslas conversion table
| milligauss (mG) | teslas (T) |
|---|---|
| 0 | 0 |
| 1 | 1e-7 |
| 2 | 2e-7 |
| 3 | 3e-7 |
| 4 | 4e-7 |
| 5 | 5e-7 |
| 6 | 6e-7 |
| 7 | 7e-7 |
| 8 | 8e-7 |
| 9 | 9e-7 |
| 10 | 0.000001 |
| 15 | 0.0000015 |
| 20 | 0.000002 |
| 25 | 0.0000025 |
| 30 | 0.000003 |
| 40 | 0.000004 |
| 50 | 0.000005 |
| 60 | 0.000006 |
| 70 | 0.000007 |
| 80 | 0.000008 |
| 90 | 0.000009 |
| 100 | 0.00001 |
| 150 | 0.000015 |
| 200 | 0.00002 |
| 250 | 0.000025 |
| 300 | 0.00003 |
| 400 | 0.00004 |
| 500 | 0.00005 |
| 600 | 0.00006 |
| 700 | 0.00007 |
| 800 | 0.00008 |
| 900 | 0.00009 |
| 1000 | 0.0001 |
| 2000 | 0.0002 |
| 3000 | 0.0003 |
| 4000 | 0.0004 |
| 5000 | 0.0005 |
| 10000 | 0.001 |
| 25000 | 0.0025 |
| 50000 | 0.005 |
| 100000 | 0.01 |
| 250000 | 0.025 |
| 500000 | 0.05 |
| 1000000 | 0.1 |
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.
What is the Tesla?
The tesla is the SI derived unit of magnetic flux density (also called magnetic B-field or magnetic induction). It quantifies the strength of a magnetic field and is used throughout physics, electrical engineering, and medical imaging.
Definition
One tesla is the magnetic flux density of a uniform field that produces a flux of one weber through an area of one square metre perpendicular to the field.
In SI base units, . Equivalently, one tesla is the field in which a charge of one coulomb moving at one metre per second perpendicular to the field feels a force of one newton: .
Origin and History
The unit is named after Nikola Tesla (1856–1943), the inventor and electrical engineer whose work on alternating current and induction motors shaped modern power systems. The name was adopted by the General Conference on Weights and Measures (CGPM) in 1960, when the tesla was formally added to the SI.
Law and Notable Facts
The tesla is a large unit; most everyday magnetic fields are far weaker. Its non-SI counterpart, the gauss, equals exactly tesla and is still common in some fields. The strongest continuous magnetic fields produced in laboratories reach around 45 T, while pulsed magnets briefly exceed 1000 T.
Real-World Examples and Conversions
- Earth's surface magnetic field is roughly 25–65 microteslas (0.25–0.65 gauss).
- A typical clinical MRI scanner operates at 1.5 T or 3 T.
- A strong neodymium refrigerator-type magnet produces around 0.1–1 T at its surface.
- 1 T = 10,000 gauss = 1000 millitesla = 1,000,000 microtesla.
Frequently Asked Questions
How many teslas are in a milligauss?
One milligauss equals 10⁻⁷ tesla (0.0000001 T), because one tesla equals 10,000 gauss.
How do I convert teslas back to milligauss?
Multiply the tesla value by 10,000,000. For example, 1 T equals 10 million milligauss.
Why is the factor so small?
The tesla is a very strong unit — Earth's field is only tens of microteslas — so ambient milligauss fields are tiny fractions of a tesla.
How strong is an MRI field in milligauss?
A 1.5-tesla MRI magnet equals 15,000,000 milligauss, illustrating the enormous span between ambient and clinical fields.
Is the tesla the SI unit?
Yes; the tesla is the SI unit of magnetic flux density, while the gauss and milligauss are older CGS units retained in some applications.
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Complete milligauss conversion table
| Unit | Result |
|---|---|
| teslas (T) | 1e-7 T |
| milliteslas (mT) | 0.0001 mT |
| microteslas (uT) | 0.1 uT |
| gauss (G) | 0.001 G |