Science Experiments: Page 21

This video introduces the formulae for watts in an electric circuit, P=IxE, P=I^R, and P=E^/R. It also explains how P=I^R and P=E^/R are algebraically derived from P=IxE and Ohm's Law.

This video describes Resistor Color Codes and how to read them. It relates Resistor Color Codes to scientific numbers and engineering notation.

In the first video, you'll see how contact between different materials can result in attraction or repulsion. Experimental results are discussed that led to Ben Franklin's one fluid theory of electricity. It explains how clues were found from rubbing different materials together.

In the first video, it introduces the principles and terminology of mechanical electrical switches. It covers terms such as contacts, normally open, normally closed, poles, and throws.

This is a guided hands-on laboratory activity to help a student understand the proper and safe use of a multimeter to measure electrical resistance. These two video guides the student through the proper techniques for measuring resistance with a multimeter, but you'll need some assorted resistors, a rectifying diode, a photo cell, an electronic labs kit, and some other stuff.

This is a guided hands-on laboratory activity to help a student understand the proper and safe use of a multimeter to measure voltage using an electronic labs kit. This video guides the student through the proper techniques for measuring voltage with a multimeter.

This two-part video describes voltage, the potential difference or "pressure" that pushes electric charges through conductors. After watching this, you'll know everything there is to know about voltage and current.

This video is about electrical wires. It describes common types, configurations of wire, and wire terminology. It explain the gauge system of rating wire size (diameter), circular mils, current capacity, and others.

Caroline and Val from New Scientist make plastic from milk and vinegar. Sure it likes like food at first, but leave it for a couple days, and it will be plastic. Just try it for yourself.

Ivan and Mick from New Scientist show us how to get the iron out of fortified breakfast cereal. You won't believe how much you can find!

See the electrolysis of water (baking soda dissolved) with copper wire. The negative side has hydrogen bubble, and the positive side has oxygen bubble. Watch the positive side as the water turns blue.

This is an amazing, scientific, rise effect with just a candle, a cup, and a Coke. Anybody can do it, so why not?

This video shows you how to make an extremely realistic, miniature volcano. You can get the Ammonium Dichromate off of eBay for around $10 a pound; a pound will easily yield over 25 volcano demonstrations. This easy DIY pyrotechnic demo will amaze any audience. Don't you just love chemistry?

Dr. Kiki creates fire from a pair of glasses, Moujan transforms an empty wine bottle into a lamp, and Heather reveals an underground band who hails from Tokyo!

Lots of newbies ask about this. Don't know why, but okay, here's how to do it -- folding a parachute for a model rocket.

It's time for a 'science is fun' video! Bar magnets put in a DVD case show how combined magnetic fields can be used to hold another magnetic object in place, even when it's an inch or so away from the actual magnet. You can even get mangnetic sand (iron, etc.) from the beach!

A trick for cutting a glass bottle.

Steve Spangler shows a science experiment in which a glass of water is able to suspend a card in mid air.

A lab exercise that demonstrates how evaporation of water lowers the temperature. Also, how surface area affects the rate of evaporation.

This video is an excellent example of how to demonstrate the doppler effect in the classroom.

Learn how to suck a hard boiled egg into a bottle using air pressure.

Learn how to make clouds in a bottle with this great science experiment.

A classroom demonstration of the effects of lowering the air pressure on the boiling point of water.

Learn how to crush an aluminum can using regular atmospheric pressure with this classroom demonstration.

This week's experiment has made the rounds through the Internet as a strange trick, but there is science here too. We are going to use the science of complex systems to confuse your body. To try this, you will need:

In this video learn how to make a mini hot air balloon. This experiment is great for kids.

This video will show you how to construct a barometer using isopropyl alcohol.

Ben and Kenji show you how to make a barometer to measure pressure and predict the weather!

Watch this video to learn how to make a tesla coil in a nutshell.

Whether you're bored out of your mind or a budding scientist, this is one cool experiment to do at home. This science tutorial teaches you how to bend fiber optic light in water using a 532 nm, 50 mW laser.

Watch this video to make a three-dimensional magnetic fields visible using suspended steel filaments (or iron filings).

A science experiment for all ages. Keep the kids busy over the holiday. This demonstration will entertain them for hours. You can have fun making one for each of the kids in your family. All you need is a penny and a bottle.

Elephant toothpaste is the name given to the catalyzed decomposition reaction of 30% hydrogen peroxide that uses soap to collect the oxgen gas that is produced. It is a favorite of most students at chemistry shows.

A seed crystal is dropped into an unstable supersaturated solution of sodium acetate NaC2H3O2 and it completely crystallized in front of your eyes. This demonstration is prepared by heating 700 grams of sodiumacetate in 50mL of water in a flask until all the solid dissolves. The solution is then cooled back to room temperature. Drop a seed crystal and see the very cool results.

The flame test is used to visually determine the identity of an unknown metal of an ionic salt based on the characteristic color the salt turns the flame of a bunsen burner.

Styrofoam is a polymer and when brought into contact with acetone the polymer breaks down into its monomers. This demonstration shows the process of depolymerization. It looks pretty cool.

This reaction is between metallic magnesium and carbon dioxide. Magnesium reacts with oxygen in the air to form magnesium oxide, but when the only source of oxygen is from CO2 the reaction becomes much more energetic. The products are white magnesium oxide and black carbon.

The trick in this how-to video works with any carbonated beverage (never use beer). Take your beverage and cool it down to a temperature around 20F or -7C. Either the freezer or outside if it is cold enough. When opened it will freeze instantly.The reason:This demonstrates the principle of freezing point depression. Pure water at 1 atm will freeze at 0C or 32F. When something is dissolved in it the freezing point drops to a lower temperature. This is why when roads are salted there are puddles...

When a quarter in pushed into dry ice, a strange thing happens. The quarter starts to quiver. It is a normal room temperature quarter. I did nothing to the quarter. This is not a trick but really happens. The evaporating CO2 creates a small air current causing the quarters to vibrate.

This can actually happen. It seems unnatural, but the laws of physics don't lie. Liquids require heat to boil, and if the conditions are right one liquid can be boiled in order to freeze a second. Under a vacuum, the water in an acetone/water mixture can freeze while the acetone boils. Watch the video and see for yourself.