Pressure

Sucking an egg into a bottle – heat and pressure experiment

Sucking an egg into a bottle Here's an interesting experiment. We promise you'll be talking about this one at school the next day. Find a bottle with a long, narrow neck and set it on the table.  The opening should be just small enough to keep the egg from falling inside. Boil and peel a egg. Have Mom or Dad drop 3 lit matches into the bottle (if Dad does the 'dropping' then make sure the fire extinguisher is handy). Quickly place the egg over the mouth of the bottle. What happens? The lit matches heat the air inside the bottle. When air is heated it expands (and takes up more room). As the heated air expands, some of it escapes out the bottle. When…
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Pressure

Skating on thin ice pressure experiment

Skating on thin ice   Pressure - you feel it at school, your teacher feels it during class (yes, a room full of little scientists can be stressful for some teachers), and your dad feels pressure when Mom asks him for the tenth time to take out the trash. Here's an interesting experiment that demonstrates a different kind of pressure - the forces of scientific pressure and how it can affect other objects. Place the corked bottle on a table. It helps if the bottle has a small neck. Balance an ice cube on the cork. Cut off a 12 inch section of wire. Tie two hammers or other heavy objects to both ends of the wire. Balance the wire across the middle of the…
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Pressure

Plastic cups in love – experimental demonstration of Bernoulli’s principle

Plastic cups in love What does a flying airplane and a pitcher's curve ball have in common. Well, besides the fact that both travel through the air at amazingly fast speeds - both are based on a principle called Bernoulli's principle. Bernoulli, (pronounced Burr New Lee) was a Swiss mathematician who liked to piddle around with these types of things. Now we get to piddle Out of the string, make 2-1 foot long pieces. Using tape, attach one end of the string to the bottom of one of the cups. Take the other end of the string and attach it to a table. Repeat steps 2 and 3 with the second cup. When taping this string to the table, make sure that the cups will…
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Pressure

Marshmallows making funny faces

Marshmallows making funny faces With this experiment we'll cause marshmallows to make funny faces and demonstrate a scien-terrific principle called pressure. Draw a face on both ends of a large marshmallow (the flat end). Draw 'em to look like Dad if possible - it'll make the experiment much more humorous. Drop the marshmallow into a glass bottle. You'll have to make sure and use a bottle that has a opening slightly larger than the marshmallow. Take the straw and wrap the clay about 1 inch from the end in such a manner that the clay forms a 'ring' around the straw. Place the short end of the straw into the bottle. The clay should stop the straw from dropping all the way into the bottle.…
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Pressure

Magical inflating balloons

Magical inflating balloons One of the first things a little scientist should learn is that heat causes things to expand (get bigger) and cold causes things to contract (get smaller). Things such as air will contract and take up less room when cooled. Similarly, things will expand when they get hot. If you don't believe this, carefully observe Dad's head the next time you break one of his expensive tools (Reeko tip - observe from a distance). Ok, so Reeko's gonna save you some heartache. Rather than test this by breaking one of Dad's tools, let's try the following experiment instead. Fill the bottle with hot water. Fill the bowl with cold water. Let both sit for one minute. Then empty out the bottle. Stretch…
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Pressure

Magical expanding soap

Magical expanding soap Yep, it floats. Ivory soap differs from most other brands in that it floats in the water. The reason – there is air whipped into the soap which makes it lighter than water. The small air pockets in the soap make for a very interesting effect when the soap bar is heated up. 1 – Take a bar of ivory soap and place it on a paper towel 2 – Place the bar in the microwave and microwave for 2 minutes 3 – If your microwave has a window, watch the soap bar as it microwaves. 4 – Allow the bar to cool for 1 minute before taking it out of the microwave Weird huh? The bar of soap will expand into…
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Pressure

Look Ma’ – no hands – air pressure experiment

Look Ma' - no hands The pushing force of air is called air pressure. The closer you are to Earth, the greater the air pressure. The farther away from Earth (in other words the higher your altitude), the less the air pressure. And remember, pressure is coming from all around us. Take the coffee can and punch 3 small holes in the bottom. Also punch one hole in the plastic lid. Now fill the coffee can about 1/2 full of water and put the lid on. Place your hand over the hole and press down on the lid. Notice how the water streams out of the holes on the bottom due to the pressure you are exerting on the lid. Now slowly stop applying pressure…
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Pressure

How capillary action makes water go up…

How capillary action makes water go Even though we usually think of water as running downhill, it can indeed flow upwards using a process called capillary action. This is the very scientific principal that explains how water goes from the soil upwards into the stem of plants. Plants contain many vein like tubes that carry water from the plant's roots upwards to the plant's highest leafs via capillary action. Try this experiment to see capillary action in action. Wrap the plastic wrap around the knitting needle and then tape the edges so that you have formed a tube. Remember, the narrower the tube, the more pronounced the capillary effect will be. Once you have taped the plastic wrap, pull out the knitting needle. Make sure…
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Pressure

Homemade Barometer experiment

Homemade Barometer The air pressure around us greatly affects our weather. Notice how your weatherman always mentions various pressure systems (low pressure system, high pressure system, etc.) and how they will affect tomorrow's weather. In this experiment, we will create a tool that lets you gauge the pressure of the air around you. Fill the measuring cup or glass with water and add some colored dye to it. Flip the empty soda bottle upside down into the glass measuring cup. Make sure that you use a bottle that is just the right size. The thicker body of the bottle should fit snugly in the measuring cup so that the mouth of the bottle does not touch the bottom of the cup. Make sure that the…
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Pressure

Extracting life from a plant

Extracting life from a plant Plants are living creatures just like Dad (OK, so plants are a little smarter). Plants need food and water just like people. But how do plants get food? Plants get their nutrients via the water they take in. Nutrients from the soil get mixed up with the ground water. The plant takes in the ground water with the sneaky nutrients concealed inside. OK Reeko, so how do plants take in water, I've never seen them slurping it up with a straw? This experiment should shed some light on this question. Fill the bottle with water. Take a freshly cut leaf or flower, wrap clay around the stem and place the stem into the bottle. Make sure the clay fits snugly…
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