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specific gravity
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in determining the specifuc gravity of liquids, is it alright to use any small bottles? And what os more accurate, using a pycnometer or a hydrometer?...pycnometer right?
smile smile...
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Re: specific gravity
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I have another question, different one about gravity. I wonder what exactly is it that causes gravity. My physics teacher once said something about every body having some sort of field of their own but didn't go into details. This popped in my head somehow for some reason just now lol.
I just love anime. ^_^
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Re: specific gravity
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by FiShStIcK-------CaNaDa
on 2006-08-18 19:08:25
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well...what cause gravity... my sicence teacher said that everything has mass can pull things closer to it, and...if we hold an apple(yummy~~!I love apple~~! en...) and release it, the apple will fall on the floor, it's because the earth is pulling the apple towards it....and...the apple was not been pulled by our body(it also has mass) because we have a smaller mass compare to the earth.(it is huge~!) the reason why my sicence teacher told my these is that I beat him up in the men's room! just kidding~~!^-^  |
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Re: specific gravity
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by
on 2006-08-18 19:33:11 (edited 2006-08-18 19:45:20)
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Gravity is one of the 4 fundamental interactions in nature, it's the weakest compared to the other three. But it acts over great distances(also called the act-at-a-distance force) and is always attractive. It is proportional to the masses of the two objects that are attracting each other, which means that however much the mass weighs, it will attract it with the same amount of force. [sry if it's a bit confusing...i'm even confusing myself...lolz] For example: If there's an object with twice the mass, gravity will attract it with twice the force, and vice versa. 
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Re: specific gravity
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by FiShStIcK-------CaNaDa
on 2006-08-19 11:04:24
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WOW...0_0 that's coooooooool.. I wish I can get into grade 12 earlier, cause the stuffs I am learning now are pretty boring -_- |
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Re: specific gravity
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| How exactly do bodies of mass attract though? I've heard that it's becuase of a particle called a graviton, even if the gravitons are just a theory. Another thing I heard was that gravity is a warp in space-time. |
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Re: specific gravity
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The gravity is responsible for our weight, if we go outside of space, our weight alters to the minimum, that's why we float. But I'm not sure, maybe it's mass.  |
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Re: specific gravity
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by
on 2006-08-19 23:22:41 |
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the mass of an object does not change at a distance. the force of gravity is innerly proportional to the square of the distance, meaning, when we are far from the earth we feel less pull of gravity on our (constant) mass. 
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Re: specific gravity
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by MiCHiYo μ
on 2006-08-22 04:27:36 (edited 2006-08-23 09:18:05)
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in short: mass does NOT change in relation to distance. wight DOES. heehee! i had trouble with that one myself. >_< -michiyo- REPLY TO KARUZO BELOW eh... we said the same thing. ^_^ 
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~*..:: i'm never going to give up... if i do, then it wasn't worth trying. ::..*~
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Re: specific gravity
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by
on 2006-08-22 05:30:49 |
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in my opinion Mass does not change in distance but weight does like in orbit if the gravity pull is strong the the object seems heavier less gravity less weight... correct me if i am wrong  --> |
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Re: specific gravity
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by yukito-san
on 2006-09-16 20:19:39
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| As an answer to Nilie's question: "What causes gravity?", the answer is, no one really knows. Though gravity is the one force in the universe we interact with the most, scientists surprizingly understand little about it. The only thing most scientists agree on is Newton's Law of Universal Gravitation, where F = G*(m[1]*m[2]/d^2) (F= force,G= gravitational constant, m[1]= mass of one object, m[2]= mass of second object, d= distance between them. Remember that science can't really provide absolute truths, they can only reduce the logic of why things happen the way they do to fundamental laws based soley on observations. |
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Re: specific gravity
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First all first, I type this in the 01.00 AM and this is in English (am not used to explain things in English) forgive me if I wrong. As far as I know, Einstein found out that Gravity does not pulling each other, but rather fall toward objects with greater mass. Consider the sun, it have such a great mass that everything are "falling" toward them. This "falling" phenomenon are described as a curve, so basically things with great mass are able to bent space and time, thus object with lesser mass are falling towards them. You may ask, if it's a curve than how curve is that curve, Stephen Hawking did this and find out that in the universe there should be a phenomenon/ a place with an almost-perfect curve, meaning such place had a GREAT mass compare to other object. Considering that, of course everything is falling toward them; even light. We can say the gravity is superb in there. Know what place is it? The black hole. Stephen Hawking finds out first before NASA tries to prove it through their scope. and thus, he prove it that this gravity is strongly correlated with the mass of the object. Greater mass produce more gravity and affect most to object with lesser mass. Just like the sun with that have greater mass than earth, hence affect the earth and another 7 (Pluto not included anymore) planets. Edit: There's also some explanation about gravity, both in discovery and the national geography. It was animated so it was better to understanding things like gravity.
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Re: specific gravity
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by
on 2006-09-17 11:40:28 (edited 2006-09-17 11:50:27)
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@yukito-san: you are quite incorrect in your answer to Nilie's question. Anyone with their "physics cap" on can tell you what causes gravity. They may say gravitons or they may say it is a direct result of matter on space-time. Either is correct, because either can be used to accurately predict the outcome of experiment, which is the the ultimate test of a physical theory. Though gravity is the one force in the universe we interact with the most, scientists surprizingly understand little about it. Anyone who says this has the agenda of intriguing but NOT enlightening the person they are talking to. We know precisely how gravity works. Never has there been an experiment where our current laws of gravity (G.R.) have shown to be wrong (you say cosmological constant and i say kablooy). In my personal opinion (and this is opinion no matter who says it, mind you) the EM force is the one we interact with the most. I'm not talking about electrical devices, I'm talking about al SOLID objects (although other phases of matter get their properties from EM as well). What makes solid things solid? The EM force: atoms electron clouds repel one another. The only thing most scientists agree on is Newton's Law of Universal Gravitation, where F = G*(m[1]*m[2]/d^2) I would not agree on this at all! Not if I was moving at 80% the speed of light relative to your reference frame (which I am!!! lol). Remember that science can't really provide absolute truths ... Please, keep your philosophical banter to yourself. This is not a debate about wether or not to teach Intelligent Design to impressionable young school children who have been possessed by the Devil. This is about gravity, Jesus Christ. Blah blah blah, I'm not listening, I'm not listening! @lenn08: bravo!! indeed Einstein lays down the  to classical physics.
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Re: specific gravity
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In space gravity is the force that objects push down on space in time (from what I've learned) but how exactly does it work because I have heard of gravitrons from a teacher but it's all very vagueso im askin if anyone can explain gravitrons to me
"Empires rise and fall, but evil is eternal"
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Re: specific gravity
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by
on 2006-09-21 16:54:35 |
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gravitons are theoretical particles that carry the gravitational force. they have never been seen in particle accelerators. you can read more about the actual interactions on the wikipedia link above. compared to the other forces in nature, gravity is incredibly weak. this is quaintly explained in string theory by the assertion that gravitons are made of closed-loop strings. since they are not open (the endpoints tied down to our universe membrane), they are free to drift out into other membranes. this seems to account for the weakness of the force of gravity. on a side note, i did think further about how we know "what CAUSES gravity". in actuality, we don't know what caused ANY of the laws of nature to come into being. when phrased as such, it is clear that we have escaped the pristine elegant realm of science and mathematics, only to plunged into the deep murky waters of philosophy and religion. yikes! i wonder, why the people who claim we do not know what causes gravity never argue we do not know what causes electrical and magnetic phenomena. it's the same ball game: a mediating particle which carries the fundamental force which moves objects around based on their physical properties (charge, in the case of electricity and mass, in the case of gravity). i know why my light switch turns on my lamp, and i know why the earth revolves around the sun, what more can you ask of science?
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