## Units for mass

$\lambda=\frac{h}{p}$

Isabel Day 1D
Posts: 48
Joined: Fri Aug 09, 2019 12:15 am

### Units for mass

I've noticed that in the De Broglie and Heisenberg uncertainty principle problems, we use kg as the basic unit for mass instead of g. This confused me at first because I thought we should always convert kilos to the base unit (grams, meters, etc.). Are kilograms always used as the base unit for these problems? Does this apply to other equations involving mass in the future as well?

Sarah Blake-2I
Posts: 153
Joined: Fri Aug 30, 2019 12:16 am

### Re: Units for mass

Since kg is an SI unit, kg will be used often, however, if the problem does not specify what units, I believe it is okay to use either grams or kilograms.

Posts: 48
Joined: Sat Aug 17, 2019 12:16 am

### Re: Units for mass

It usually makes more real-life sense to use grams, but since the SI unit is kg, it's often asked for in chemistry problems.

Donavin Collins 1F
Posts: 66
Joined: Sat Sep 14, 2019 12:16 am

### Re: Units for mass

I believe it wouldn't matter too much if you used grams or kgs, as long as it isn't specified to use a specific unit.

Betania Hernandez 2E
Posts: 107
Joined: Fri Aug 02, 2019 12:15 am

### Re: Units for mass

Kg is used often because it is an SI unit which is used in DeBroglie's equation.