# Cgs to SI unit conversion

• I
• SorenaJ

#### SorenaJ

Hi

I have a value that is 10.7 mJy, that I need to convert to SI units. I thought it would be 1.7*10^(-2)*10^(-26) but that might be wrong?

Then I have a flux value, kappa, of 2 cm^2.g^(-1) that needs to be converted to meters and kilogram. I thought it was 2*10^(-7) m2/kg, but that might be wrong as well. I would get the 10^(-4) from converting from cm2 to m2 and the 10^(-3) from converting from g to kg.

Can anyone help?

In the second part, you have the grams conversion wrong because it has a negative exponent. You should be dividing by 10^(-3), not multiplying by it.

I have no idea what a mJy is, but the 10^(-26) is a truly large factor.

Hi

I have a value that is 10.7 mJy, that I need to convert to SI units. I thought it would be 1.7*10^(-2)*10^(-26) but that might be wrong?

10.7 = 1.07 × 10

10.7 m = 10.7 × 10-3 = 1.07 × 10-2

Don't drop those zeroes!

BTW, this is the definition of the Jansky (Jy):

https://en.wikipedia.org/wiki/Jansky

1 Jy = 10-26 W / (m2-Hz)

Thank you!