## New Blog with Simple Demonstrations and Scientific Explanations

Posted on May 2, 2012  Comments (3)

Try this at home is a new blog by Dr Mark Lorch, a chemistry lecturer at the University of Hull, with instructions for the citizen scientist. This example shows how to move a can with a ballon without touching the can.

The posts include instructions on how to do these simple demonstrations and a nice explanation on the scientific reason for what is going on:

Rubbing the balloon on your hair charges it up with static electricity which makes the balloon negatively charged. When you put the balloon near the can it pushes electrons (which are also negatively charged) to the other side of the can. This makes the side which is nearest the balloon positively charged. Positive charges are attracted to negative charges so the can moves towards the balloon.

It is quite a nice site (especially if you have kids interested in science or are a kid interested in science – no matter how old you are), add it to your RSS reader. Here are some more science blogs you may enjoy.

3 Responses to “New Blog with Simple Demonstrations and Scientific Explanations”

May 2nd, 2012 @ 4:42 am

I was just wondering if he can is round in shape then how come the electrons are shifted to one side? I mean there should sort of equal spread of the electrons which would make the can resistant to the electrons shift. What would you say about it?

2. Mark
May 2nd, 2012 @ 1:25 pm

Good point, my explanation is as follows. If someones got a better one I’d like to hear it.

Rubbing the balloon on your hair charges it up with static electricity which makes the balloon negatively charged. When you put the balloon near the can it pushes electrons (which are also negatively charged) to the other side of the can. This makes the side which is nearest the balloon positively charged. Positive charges are attracted to negative charges so the can moves towards the balloon.

http://www.t2ah.com/2012/03/number-5-rolling-can.html

3. Huskar
May 2nd, 2012 @ 10:49 pm