You are Here: Home >< Maths

# Quick unit query watch

1. Hi, I seem to have forgotten how to do this...

50cm2 x 2.87ug cm2 hr-1 = C x 21L/h

I know how to find the answer for C by rearranging but having diffilculties in what the unit should be.
Can someone help? thanks.

edit: I think I done it: ug/cm3
2. You have cm2 * μg * cm2 * hours-1 on the left hand side, which is of dimension (length)4 * (mass)1 * (time)-1, and on the right hand side you have C * L * h-1, which (I presume) has dimension [C] * (length)1 * (time)-1, for some unknown [C]. Dimensions on the left and right must be the same, so equate these two, and solve for [C] just like you'd solve for any unknown.

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 24, 2010
The home of Results and Clearing

### 3,731

people online now

### 1,567,000

students helped last year
Today on TSR

Hang on, have Edexcel's come out already?

### University open days

1. SAE Institute
Animation, Audio, Film, Games, Music, Business, Web Further education
Thu, 16 Aug '18
2. Bournemouth University
Fri, 17 Aug '18
3. University of Bolton
Fri, 17 Aug '18
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams