What is experiment variable?
A variable experiment is something that can happen The fact that it might start raining right now it's a variable experiment You can not say it I will happen right now or when it will come. It's like a variable.
What is a fair test in science?
fair test science It is important for an experiment to be a fair test. You conduct a fair test by making sure that you change one factor at a time while keeping all other conditions the same. For example, let's imagine that we want to measure which is the fastest toy car to coast down a sloping ramp. If we gently release the first car, but give the second car a push start, did we do a fair test of which car was fastest? No! We gave the second car an unfair advantage by pushing it to start. That's not a fair test! The only thing that should change between the two tests is the car; we should start them down the ramp in exactly the same way. Let's pretend we're doing an experiment to see if fertilizer makes a plant grow to be larger than a plant that doesn't receive fertilizer. We put seeds of the same kind in three pots with fertilizer and rich soil. But, we run out of soil so we put the seeds without fertilizer in three pots filled with sand. We put all six pots in the same location and water each one with the same amount of water every other day. The plants with soil and fertilizer grow to be much larger than the ones grown in sand without fertilizer. Is that a fair test of whether fertilizer makes a plant grow to be larger? No! We changed two things (type of soil and fertilizer) so we have no idea whether the plants with fertilizer grew to be larger because of the fertilizer or whether the other plants were stunted by being grown in sand. It wasn't a fair test! All of the plants should have been in the same kind of soil. Conducting a fair test is one of the most important ingredients of doing good, scientifically valuable experiments. To insure that your experiment is a fair test, you must change only one factor at a time while keeping all other conditions the same. Scientists call the changing factors in an experiment variables.
What makes a fair test in science?
A fair test would be an experiment where it is possible to accurately predict the outcome through theoretical work and the ability to repeat this multiple times where the spreading of the results is less then 5% or 10% on average.The most important bit here is the ability to do the same experiment multiple times, if this isn’t possible it becomes quickly impossible for you to say with certainty if there are possible variations and what might cause them, if you find the source of those variations(like sample weight or amount) it can be possible to correct for them later in the experiment.
What is a good high school level science fair experiment I can do regarding corrosion and rust?
One area of inquiry you might consider:It is thought that as global climate change proceeds, the higher carbon dioxide levels will result in higher acidity levels in the oceans. Everyone is concerned about the impact on corals and other marine life, but not much is being mentioned about how a change in pH levels in ocean water might change rates of corrosion on objects that are exposed to seawater (e.g., bridges & piers, ships, buoys, etc.) You could set up an experiment to test how long exposed iron takes to rust in salt water with two different pH levels associated with former and forecasted future expected levels. You could conclude with some discussion about what different rates of corrosion might mean.Given the interest in global climate change, a good presentation could attract a lot of attention.
Why do variables need to be held constant in a science experiment?
Suppose we're doing an experiment - to decide whether my car will go faster with or without racing stripes on the hood.So I find a nice long stretch of road - and with no stripes on the hood, I floor the gas pedal...it goes up to 100mph - and won't go any further. OK we have a data point. So now I stick some vinyl stripes on the hood and carry on driving along the road - this time, it only goes up to 120mph. Hmmm - so the stripes seem to work!I drive home again and repeat the experiment on five consecutive days...same results!"RACING STRIPES MAKE YOUR CAR GO 20% FASTER!!!" is the headline news.The problem is that I was driving along a road that goes flat and then downhill...and the amount of gas in the tank changed from the first part of the test to the second so the car weighed less on the test with the stripes. Oh - and the engine was cold during the first test, and hot by the end. All of those things are known to affect the speed of a car - so my experiment was garbage. My experiment actually gave me no information whatever about the efficacy of racing stripes on a car.So I need to control for changes in the slope of the road - and for the amount of gas in the tank - and for the air temperature and pressure - and for the pressure in the tires and a bunch of other things. Each test has to be as exactly identical to the others as possible - with the ONLY difference being whether the car has stripes on it or not.Only when I carefully eliminate all of those other variables do I finally discover that putting fancy racing stripes on my car doesn't make a damned bit of difference to how fast it goes.In real science, it can be exceedingly difficult to eliminate ALL of the variables - and there have been notable cases where people missed something subtle but important and came up with an incorrect conclusion as a result. This is why it's important to be skeptical about your results - and to have other people re-test your experiments.
Is this particular algae biofuel science fair experiment feasible?
As nobody else* appears to have responded, here is my 2¢—but I admit to not being very familiar with Science Fair requirements from the outset.I looked through the proposal, but without digging so deep at to look at the details for making your own calorimeter.It seems robust enough on the surface, though I'm a bit sceptical about the proposed method of drying algae in a microwave, I think a regular oven, on low heat would be more appropriate.But it doesn't seem to go far enough, certainly not to justify the tags about Biofuel. It invites the experimenter to form a hypothesis about production levels of oils by the algae, but not to run any controlled condition tests. And it seems to be making the assumption that any calorific content is attributable to oils, rather than doing anything to verify that assumption, which I think would be necessary to validate the method. So, some solvent based extraction method to separate oils from carbohydrates and proteins might be a useful extension of the technique.In short—it's a start, but I think it needs more.* Sorry, Glauco—you must have been writing around the time I last looked, or perhaps the Quora app just doesn't update quite fast enough.