## speed of diffusion

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mustangsally
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Posts: 12
Joined: Fri Jun 10, 2005 1:21 pm

### speed of diffusion

I am having trouble understanding how to calculate speed of diffusion. The lab book states "multiply the length of time and the distance moved by 6 in order to calculate the speed of diffusion:______mm/hr." I do not understand how to do this calculation. The length of time I have is 10 mins and the distance moved is 9.2 m.

This may be a simple mathematical equation, but I have not been in school in _at_ 25 yrs, and it is boggling my old brain. Any help is appreciated

Chris4
Coral
Posts: 286
Joined: Mon Mar 07, 2005 4:56 pm
Location: UK
What is this multiply by 6? I maybe could understand 60 as that would change hours into minutes or whatever.

I don't if there is a special calculation for diffusion but I would just do this:

10 mins = 0.166 hr (10/60)

9.2m = 9200mm.

so 9200/0.166 = 55,200 mm/hr.

Anyone want to tell me im wrong. or right?

mustangsally
Garter
Posts: 12
Joined: Fri Jun 10, 2005 1:21 pm
thanks. i didn't understand about the multiply by 6. the other execises used the same equation as you. i have a very inquisitvie mind and can't stand not knowing about something like this.

canalon
Inland Taipan
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Easy but the explanation is bad. In fact what you are supposed to do is
1/(9200*6) and you get the good result. Why simply because you are in fact calculating:
(1/6)*(1/9200)
The first part of the equation is the conversion of time into hours 10 minutes= 1/6 of an hour

Or multiply the time by 6, convert minutes in hour (yeah I know: 1 hour) and divide this by the distance multiplied by 6.

Chris4 Explanation is probably better, but those completely stupid explanations fits with your text...

HTH

Patrick

Chris4
Coral
Posts: 286
Joined: Mon Mar 07, 2005 4:56 pm
Location: UK
Glad i was pretty much on the right track. Soz about my rubbish explanations and text, i did rush through that.

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