for those who wonder about such things...

[clickie]

I weighed one pump of liquid hand soap vs. one pump of foaming hand soap. The liquid soap weighed 2 g, while the foam soap only weighed .83 g. If you want to save soap, the foam is definitely the way to go.

Comments

[rabswom]

Daisie, you're awesome.

[yuda]

Except that I always wind up using multiple pumps of the foaming stuff because it washes away too quickly.

[clickie]

Seems to me that you're not one who is interested in saving soap, then :P Still, two pumps of foam is still less than one of regular liquid.

[tyopsqueene]

You are so full of useful STUFF.

(I use hard soap but I appreciate it anyway)

[sisyrinchium]

Yabbut, what's is the cost per use, and what is the level of effectiveness for each?

[clickie]

Hey, all I had was a scale. Methodology suggestions?

[sisyrinchium]

I think you got me there.

If I had funding for this, I would take one of each and count the number of uses I could get out of each. Before and after each use, (over weeks I assume) I would leave my palm print on a culture plate. I would record what I had been doing before each use so as to have some idea if each were more effective against certain kinds of germs, as well as the number of colonies from before and after cleanings.

Assuming about 50 uses from each bottle, sample size should be adequate, but 200 plates would be used.

On second thought, I'll just stick with regular soap.

[clickie]

You could probably pare down the methodology a bit...start out with a measured, smaller amount in each type of dispenser, say, 2 oz each in 10 oz bottles, and maybe just a culture swab after randomized uses?