Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: abdi0008 on 12/01/2006 17:14:04

Title: calculating density/viscosity of glycol water
Post by: abdi0008 on 12/01/2006 17:14:04

calculating density/viscosity of glycol water mixture(50/50)
in vapor or gas phase?

any hints

Title: Re: calculating density/viscosity of glycol water
Post by: daveshorts on 15/01/2006 10:34:11

When things are in the gas phase to a very good approximation each molecule of gas will take up the same space irrespective of what it is. 1 mole (the molecular weight of the stuff in grams) at room temperature will take up 24litres.

1 mol (18g) of water will take up 24l

ethylene glycol (C2H6O2)
1 mol (~62g) of glycol will also take up 24l

So if you have a 1:1 ratio by weight
18g of water will take up 24l
18g of glycol will take up ~7l

so you have 36g in 31litres

so the density will be about 1.1g/litre at room temperature

the density will also be inversely proportional to temperature measured from absolute zero.

As to the viscosity good luck, I don't know of any simple way of measuring it. If it is definitely a gas then I would say a bit more viscous than air to within a couple of orders of magnitude.