Science Experiments

having sex

it's better to have a control but no you do not have to have a control in a science fair project

thermal energy

Since the very idea of science is to establish facts and research various areas, to prove that these results are correct they must be replicable. Since this is very difficult to do without knowing exactly how the initial experiment was conducted, an accurate record is required.

a notverynicean

No. If you have a mixture of water and ground pepper, you can separate the pepper by pouring the mixture through a funnel lined with filter paper. The water will pass through the paper leaving the pepper behind.

The climax in Dr. Heidegger's Experiment begins when the guests drink more of the elixir and become louder and more frenzied. Then, the climax peaks when the vase is broken.

Of course not .Because most of the beaker is made of plastic ,we are not often see beaker made of ceramic and metal

OK, its either likhanate or chagatai ^_^ i also don't know why it says these aren't valid words

Seeds to raise F1 generation

Decision Making

water is not measure in unit of mass but in volume for it is a liquid and liquid is measure in volume. confusing

Being that this was placed in the science experiments category, I will base my answer on the belief that you are asking about real-world technology. "Laser technology", while not new to the world is definitely not a hand held-item. In large industrial factories, it maybe used for various purposes. Certain experiments have been done prior and currently with rail gun technology which is NOT the same.

Rail guns fire a projectile accelerated by electric-charged magnets spanning the barrel. This is an effective technology on larger weapons but is not proficient in handheld weapons to my knowledge.

Likewise laser technology, even in beams, is not practical and no where near hand held... so although the thought of laser weaponry is good, it would be ineffective. The laser technology of current emits a laser that takes time to wear through its target, not instant penetration like Star Wars. Your only practical option left in this case is a conventional projectile firearm (a.k.a. bullet guns).

Because ice is less dense than the water it floats in. However, if your question relates to why there are icebergs in the Antarctic and Arctic, but not in other waters, it is due to a number of reasons, such as :

- The icebergs are (generally) formed when a slab of the Antarctic or Arctic ice cap close to the sea breaks off (it must be noted, however, that there is no land at the north pole, so the Arctic ice cap is simply one massive iceberg) and floats away.

- In the Antarctic something called the Antarctic Circumpolar Current (http://en.wikipedia.org/wiki/Antarctic_Circumpolar_Current) causes the icebergs to whip around the Southern Ocean, rather than venture out into warmer waters

- Also, icebergs do float upwards into the warmer oceans of the world, but melt as they encounter warmer climates and waters.

The final temperature would be a weighted average of the initial temperatures, based on the quantities of each liquid. Assuming both cups contain the same amount of water (let's say 1 cup each), the final temperature would be approximately 30 degrees Celsius.

The experiment is another example of the chemical interaction between acids and bases. In the experiment, a closable plastic lunch bag is filled with warm water and vinegar, and a wrapped packet of baking soda is added. The bag is closed and the reaction between acid (vinegar) and baking soda (base) creates pressure by generating gas (carbon dioxide) within the bag.

The bag swells and usually explodes (ruptures) unless the pressure escapes. This shows that a chemical reaction can indirectly release energy as it forms new chemical compounds.

An experiment is constructed to prove a hypothesis. If you do A+B-C; then you should always arrive at D as a result. Do a thousand test experiments without variation and the result should always be D.

When you publish your results, other scientists around the world who follow the steps in the experiment you have outlined will also always arrive at the same result. These replications of the experiment by your peers will prove the validity of your hypothesis.

No. Sorry

Practice safe sun.

I'm assuming that your experiment was one where systematic and random errors could've occurred, yes? Simply, it is to reduce the possibility of any inaccuracies, because from collecting 5 measurements you are able to obtain an average and also judge each measurement individually to see the differences. It really will just prove whether the conducting of the experiment was consistent in correlation to the results attained.

Apex Experimental results are not reliable if they are not repeatable.

It has power but not authoirty

some typical experiments would be anything to do with an object moving in a particular direction at a set distance. So for example you could throw a tennis ball and time it from the second it was released from your hand to the second it stopped and measure the distance from where you threw the ball to where it stopped, then divide that distance by the time is took to stop there. Simply change the object moving for other experiments.