science, particle theory?

Question

I have recently just done a experiment that has to do with mass, capacity, weight and volume. I filled the beaker with 100ml of water. It turned out to be 90.4 grams after I subtrated the weight of the beaker. Then I tried doing it with 200ml of water. I got 197gram after I subtracted the weight of the beaker. Shoudn't it be 180grams instead of 197 cause it's doubled? I made sure I used the triple beam balance correctly and I used the same beaker. Basically what im wondering is, does it have to do with the particle theory? like what happened to the particles?

Answer 1

Well, first off, for your level of accuracy water weighs 1 gram per ml. Therefore, after you tared out the weight of the beaker, you should have measured out 100.00 grams. I'm guessing that you didn't tare out the beaker, which means you got a erroneous answer.

When you then added the second 100 ml, that would have been a pure weight of water. Therefore, you should have had 200 grams, plus the weight of the beaker.

I would redo the experiment. You know that the initial weight has to be 100 grams + the weight of the beaker, otherwise you measure incorrectly. The second measurement would have been 200 grams + the weight of the beaker.

Finally, not really sure what you mean by particle theory. For all experiments we do in ordinary labs, fluids such as air, water, etc can be considered continuous. The exhibit no particle characteristics whatsoever (not entirely true but true enough). When you start looking at extreme temperatures, pressures, and energies, you start to see quantum effects. You can account for energy transfer, such as heat, as transfer between particles in a statistical manner - hence statistical thermodynamics. This is probably advanced for you, although if you enjoy physics and experimentation I strongly suggest you keep up the excellent work, and within 5 or 6 years you'll be studying quantum and other fun stuff.

Answer 2

Well, it's much simpler than that. It's simply erroneous measurement. The density of water is 1g/ml. This means that every milliliter of water has a mass of 1g. The first measurement ( of 100mL) is simply very wrong. The density of water varies slightly with temperature, but not enough to account for the large error. The 100mL of water measured should weigh very close to 100g.

However, you should also note that the accuracy of beakers in general is very poor. There is a large deviation in measurement using beakers. For more precise measurements, graduated cylinders or pipets should be employed. You can see the error in the second measurement (which is probably correct) which shows 1.5% instrumental error (which is alot).

The simple answer is the measurement was done incorrectly. Did you make sure to measure from the bottom of the meniscus?

Answer 3

Um, last I checked one ml of water should be exactly one gram - so none of your measurements are correct. Sorry.

100 ml (cubic centimeters) of water = 100 g
200 ml (cc's) of water = 200 g

Either the scale you are using is off, you're measuring the quantity of water incorrectly, or you're wrong about how much the beaker weighs. This has nothing to do with partical theory.

Answer 4

You are measuring incorrectly.

100mL of water ought to weigh a hundred grams. 200mL of water should weigh 200 grams. If that's not what you got, within a a couple of grams, then you've done something wrong.

Answer 5

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