Question 1

What is a gamma in magnetism?

Accepted Answer

Gamma is an old CGS unit equal to 1 nanotesla (nT). Used in geophysics and space science for measuring weak magnetic fields. Earths magnetic field varies about 25,000-65,000 gamma (nT).

Question 2

Why is gamma still used in some fields?

Accepted Answer

Geophysicists and space scientists continue using gamma because historical data was recorded in this unit. 1 gamma = 1 nT exactly, making conversion simple but the term persists in literature.

Question 3

What's a typical magnetic field strength?

Accepted Answer

Earth's field: 25-65 microtesla. Fridge magnet: 5 millitesla. MRI machine: 1.5-3 tesla. Strongest lab magnets: 45+ tesla.

Question 4

Why do we have both Tesla and Gauss?

Accepted Answer

Tesla is the SI unit; Gauss is the older CGS unit. 1 Tesla = 10,000 Gauss. Both remain in use across different fields and regions.

γ to nT Converter

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