# The Naked Scientists Forum

### Author Topic: What is "mg per cent?"  (Read 4567 times)

#### Cut Chemist

• Full Member
• Posts: 96
##### What is "mg per cent?"
« on: 05/08/2007 03:23:36 »
I was reading some older medical journals, and ran across this unit for concentration, which I didn't understand.

My best guess is that it means 1.00 mg per 100.00 mg (% by weight)

Anyone familiar with these units??

#### eric l

• Hero Member
• Posts: 514
##### What is "mg per cent?"
« Reply #1 on: 05/08/2007 09:09:58 »
I have read similar data (expressed in mg percent) and based on the values I would guess it to be mg per 100 g.  But that is just an "educated guess".  (I also met concentrations given in mg/dl, which in water would be very much the same)

#### chris

• Neilep Level Member
• Posts: 5294
• Thanked: 61 times
• The Naked Scientist
##### What is "mg per cent?"
« Reply #2 on: 05/08/2007 12:31:12 »
When you make a solution by percent you are dissolving a mass (usually in grams unless otherwise stated), in 100 ml (= 100g if it's water) of solvent. So mg percent in the context of a blood alcohol means the number of milligrams of ethanol (alcohol) per 100 ml of blood.

Chris

#### The Naked Scientists Forum

##### What is "mg per cent?"
« Reply #2 on: 05/08/2007 12:31:12 »