Science Experiments

Experiments often conducted by students to test different scientific theories and hypotheses

Asked in Physics, Space Travel and Exploration, Science Experiments, Sound Waves

What is the speed of ultrasound waves in the air?

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The 'normal' speed of sound is 340 m/s in dry air at room temperature and pressure. From your question, it appears we should differentiate the terms "ultrasonic" and "supersonic". Ultrasonic relates to sonic frequencies higher than 20 KHz, i.e. beyond audible range. For a given gas, the speed of sound is independent of the frequency of the sound measured and also independent of the density of the gas. Supersonic relates to a speed of an object greater than the normal speed of sound (340 m/s in air at STP) and usually the phenomena associated with it. The speed of sound is also a functionof the medium through which it's passing. For example, the speed of sound through water is 1,500 m/s, and is slightly over 5,000 m/s in iron. So to answer your question, the speed of ultrasound in airis340 m/s for the reasons given.
Asked in Laboratory Testing, Science Experiments

What is control group in science?

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The one not experimented on. The control group is used to compare results to, to check that the changes you made during the experiment were responsible for the results seen in those groups. In other words, you use the control to confirm if the results shown in the experiment were caused by the independent variable (the variable that you change and are trying to investigate).
Asked in Graduate Degrees, Physics, Chemistry, Science Experiments

What is adiabatic calorimetry?

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Adiabatic calorimetry is used primarily for the study of thermal hazards and the consequences of a maloperation during a process, for instance a misfeed or loss of cooling. This is because on larger scales the effective natural cooling rates are negligible in comparison to heat generation, and many large process vessels can therefore be considered to be adiabatic. An adiabatic calorimeter is designed to simulate the thermal behaviour of larger scale chemical reactors, especially when studying uncontrolled and run-away reactions.
Asked in Weight and Mass, Science Experiments

What weighs 1 gram?

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A pen cap is around 1 gram. 1000 mg can weigh 1 gram. 1 mL of water weighs 1 gram
Asked in Meteorology and Weather, Thunderstorms and Lightning, Science Experiments

What is a byproduct of lightning?

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The byproducts are: - thunder - ash (trees hit) - fulgurites (strands of sand glass) - ozone - Buckminsterfullerenes : minute quantities of the fullerenes, in the form of C60, C70, C76, C82 and C84 molecules, are produced in nature, hidden in soot and formed by lightning discharges in the atmosphere
Asked in Science Experiments

What are some good science fair ideas?

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11. What happens if you put Gorilla Glue in water?
Asked in Chemistry, Science Experiments

Can you strike a safety match on glass?

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Yes! Safety matches contain sulfur, an oxidizing agent, and powdered glass (along with wood and glue etc.) and the strike-on-box strip contains powdered glass or silica sand and red phosphorous (and glue etc.). The friction of the glass on the match head with the glass in the strip is enough to ignite the red phosphorous which does a whiz-bang reaction which lights the match. While striking on a window isn't as easy because it doesn't have the added phosphorous whiz-bang, it's still possible for the glass-on-glass friction to provide enough heat to light the match anyway. You can see it on youtube or try it yourself (just make sure to rub out the marks on the glass & keep things safe).
Asked in Monkeys, The Moon, Science Experiments

How is the gibbous moon and gibbous monkey alike?

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That's a misspelling; gibbous is a phase of the moon (more than half but not full), and Gibbons are a species of ape.
Asked in Science Experiments, Organic Chemistry

What is the atomic number of CH4?

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Methane is a compound and therefore does not have any atomic number. It is composed of carbon with atomic number 6 and hydrogen with atomic number 1.
Asked in Science, Chemistry, Science Experiments

Would salt water cool faster then fresh water?

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Salt water does cool faster than pure water.
Asked in Energy, Science Experiments

Write few lines on Sun -The Ultimate source of energy?

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The ultimate source of energy was probably the energy which made the big bang. Everything since, galaxies, stars, planets, comets, expansion, seems to have come from that. A tiny part of that energy created our solar system. Most of the solar system energy is stored in the Sun, our star. The energy stored in our star, largely in the form of hydrogen gas, is slowly being released as sunlight radiation by the conversion of the sun's hydrogen to helium via the process called fusion. Four hydrogen atoms fuse into one helium atom. The helium nucleus masses a smidge less than the four hydrogen nuclei (which are protons) and the difference in mass appears as energy according to the equation E = mc2. {The Hydrogens mass 1.008 each, or 4 for 4.032. The helium masses 4.003. Thus 0.029 atomic units have been converted to energy.} Of course, this is per helium nucleus, and there is a lot of gas on the sun, and there is that multiplication by c2. All the energy we have or receive, except possibly nuclear, comes from or came from our Sun.
Asked in Physics, Chemistry, Science Experiments

Why does CO2 turn from gas to liquid when it it compressed?

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CO2 turns from gas to liquid when compressed because the CO2 molecules are forced closer together, which forms a liquid.
Asked in Science Experiments

What does data mean in a science fair project?

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A data analysis to a science fair project is like summing up your project/experiment to a small paragraph or two i hope this made sense to you :)
Asked in Chemistry, Science Experiments

Why does boiling syrup produce more severe burn?

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Because it stick's to your skin, and keep's burning instead of burning you once and running off. It also has a higher melting point ( I think it is 140 degree's, but I am not sure on the exact temp.! )
Asked in Inventions, Chemistry, Science Experiments

Does rice paper dissolve in water?

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NO Yes, rice paper will dissolve in water. If you do a quick google search you will see many people saying it will and some saying if you get it wet, it dissolves. Previous person who answered is incorrect.
Asked in Ecosystems, Science Experiments

What is an ecological barrier?

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biotic barriers to dispersal/establishment (ex. competition, pollination vectors)
Asked in Science Experiments

What is sieving used for in everyday life?

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Getting weevils out of flour. Also helps aerate the flour. Removing contaminants from a process fluid.
Asked in Science, Chemistry, Science Experiments

What are some examples of corrosion?

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Iron and steel rusting is an example of corrosion. Copper pitting or the green patina one sees on copper roofs are also examples of corrosion. Stress Cracking is also considered an example of corrosion.
Asked in Science Experiments

Why do people slow down when they see accidents?

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Well that's a random but good question. People sometimes slow down at car accidents because they just kindof realized that they saw death. Their life flashes and they feel for that person that passed. And what their family mst be going through. So instead of yelling they slow down and be nice.
Asked in Science Experiments, Constellations

Why can't you see all the constellations at once?

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The Earth is a sphere. An observer looking up can only see the stars on their side of the planet. As the Earth rotates, it exposes the observer to the other stars visible to their hemisphere. Simply put, the earth gets in the way. If the earth were to disappear and you were floating in space, you could freely look around at the celestial sphere and observe the constellations. The number of constellations visible would be limited only by the range of your vision, which still would be insufficient to see in every direction simultaneously.