Science is sometimes looked upon by young people as too "brainy" or too difficult or not exciting. I have found that there are many things that are complicated and possibly would tend to avoid them, unless, a simple explanation, or demonstration could be given. It is my intent then, to give some easy demonstrations and/or experiments that the Elementary teacher could use.

One of the primary things that most teachers fear is safety. Things happen but most can be prevented if certain precautions are taken. Also, a little bit of common sense goes a long way. Don't let the fear get in the way of some great visuals for your students. So, with that, I would like to give you a simple demo that identifies PRESSURE and how strong air molecules are.

For materials you will need: 33 gal plastic bag, or for larger people, 42 gal or 55 gal work well; small vacuum like the "shark"; a willing student to be "vacuum packed".

Your procedure will be to ask the student to step into the bag, kneel down and hold the vacuum hose with both hands next to their chest. They are to make sure that the opening will not be covered so they might cup one hand around but not over the opening. The teacher will then grab the bag and gather it around the person's neck (don't choke them) to make an air tight seal. Turn on the vacuum and watch as the air molecules on the outside begin to push in the plastic bag. When the student becomes "vacuum packed" , ask them to stand up or move their arms. They will soon say that they cannot. This is because the air molecules on the outside of the bag are so strong, that they hold the bag against the person. By turning the vacuum off, and opening the bag a little bit, you introduce air molecules back into the bag to equalize those on the outside of the bag and the young person can now move.

Safety: no goggles are needed here but watch for the breathing of the student. The vacuum will make it harder to breathe, but should not be of concern. Just watch and be aware.

I hope to give you some more ideas in this column and if you want specific suggestions, e-mail me at dterasaki@boylan.org