Re: effect on making bubbles with hot or cold water

Dear Teresa,
There are many ways of making soap bubbles, but I shall assume that you 
simply blow into soapy water with a straw, so you either get many small 
bubbles or few large ones with you breath.. A scientist is also a bit 
unhappy with words like "hot" or "cold": This can be anywhere between 
freezing and boiling.
 After this bit of "hedging", which is also typical of scientists, let's 
assume that the cold water is warm enough to dissolve the soap. Then you 
should normally get bigger bubbles with the colder water, because bubbles 
depend on ordering of molecules at the surface, and higher temperature, 
where molecules wiggle more feverishly, tends to destroy such order. 
Viscosity of the solution also drops with increasing temperature, making 
the bubbles more unstable. Bigger bubbles - see above - means a smaller 
number of them. 
 Best Regards
Werner Sieber