Compare & contrast the method used to find density of gas w/ method used to find density of a liquid or solid.
371312
Finding the density of a gas requires information on pressure, and temperature.  d=pM/RT where d is density, p=pressure in atm, M is molar mass, R is the gas constant, and T is temperature in kelvin.  For a liquid the only factors to calculate density are mass, volume and temperature.  d=m/V...at a given temperature.  For solids the mass and volume are only needed.
282227
http://www.answers.com/topic/density?method=22\nhttp://www.reference.com/search?q=density
344825
density is mass divided by volume - so if you know the volume and the density, then you multiply them to get the mass  (which is synonomous with weight)
739108
since density equals mass over volume (d=m/v) mass willbe equal to volume times density (m=vd)
827958
The first part is correct.  If the numbers in the second part are correct, it is true only for an ideal gas.  Other materials have various densities in their liquid and solid states.
280201
Density = mass/volume
733307
Here you go ...\n\na)  The idea of buoyancy was summed up by Archimedes, a Greek mathematician, in what is known as Archimedes Principle: Any object, wholly or partly immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object. \n\nb)  DENSITY is a physical property of matter, as each element and compound has a unique density associated with it. Density defined in a qualitative manner as the measure of the relative "heaviness" of objects with a constant volume.\n\nFor example: A rock is obviously more dense than a crumpled piece of paper of the same size. \nA styrofoam cup is less dense than a ceramic cup.\n\nDensity may also refer to how closely "packed" or "crowded" the material appears to be - again refer to the styrofoam vs. ceramic cup. \n\nc)  Low pressure areas have less atmospheric mass above their location, whereas high pressure areas have more atmospheric mass above their location. Similarly, as elevation increases there is less overlying atmospheric mass, so that pressure decreases with increasing elevation.  As elevation increases, the number of molecules decreases and the weight of air therefore is less, meaning a decrease in air pressure. In fact, while the atmosphere extends more than 15 miles (24 km).\n\nI hope this helps.
706444
Density= Mass/Volume.  When water freezes, its volume increases. This is why a frozen bottle of water expands to the point of bursting. By the formula, if volume increases and Mass stays the same, then the value of density decreases.  Thus, this is why ice floats and is less dense than water.  When the ice melts, the reverse happens in that its volume decreases and again by the formula, density will increase.   Tahdaaaa!!
1102336
Density is the mass per unit volume of a substance while specific gravity is an index that describes the ratio  of the substance density to the density of water.
882394
Density=Mass/volume, Therefore heating a gas increases its volume. This change has to be compromised by either mass or density. Mass cannot vary as it's a constant, so the density has to give way. Hence the change in density. When volume increases, density decreases as they are inversely proportional.
326804
There's an even easier method than calculating the density. Jewelers use it all the time. Gold is about the least reactive element in the periodic table, so simply bringing the gold in contact with acid will tell you.\n\nIf there is a reaction, if the metal is etched, then it is not gold, or it doesn't contain a high concentration. If nothing happens, then it's gold. I wouldn't recommend doing this yourself, however. A very strong acid is generally used. Also, if the object is something you don't want damaged, even if it isn't gold, I'd urge caution or another method. Or just go see a jeweler.\n\nThe density method works too, just be sure that if it is a necklace or something like that, shake out all the air bubbles in the links. A friend of mine thought a necklace that he bought for his wife was fake because he did a density analysis and determined it wasn't gold. The jeweler did an acid test and said it was gold. My friend repeated the experiment and realized he did not shake the air bubbles out of the necklace.
501128
Inside or outside volume?\n\nInside:  Can't use Fluid => Gas or liquid.  Use solid like sand to fill the vase.  Takeout the sand and measure the volume either by weight/density or use another standard measuring device.\n\nOutside: Trace the curve, find out how many continuous sections are there that are connected at discontinuous boundaries, find volumes of each (use cylinder or cone volume formula) and add up the volumes.
980362
you cant you have to have mass and volume to find density
1000766
The low technology approach is to use a densitometer.  This can be as simple as a hydrometer as used in the brewing industry to check for specific gravity (density).  From a measured density and a known volume and if you know the densities of both liquid components of a binary mixture you can work out the relative proportions of each using simultaneous equations and hence the concentration of one in the other.
126356
That conversion depends upon the density of the substance that is being converted. For example, one cup of water has a different weight than one cup of salt. Each substance has a different density, which is the ratio of a substance's weight to its volume. You can either lookup the density of the substance that you are trying to convert elsewhere on the Internet, or you can perform a simple experiment by weighing a specific volume of the substance using a scale. From that ratio, you can then calculate the mass (weight) of any other specific volume of the substance; also, given a mass (weight), you can calculate the volume of the that substance.
697322
Air is composed of eight or so chemical molecues and combines to create a gas. Water is composed of hyrogen and oxygen molecues and exists as a liquid or solid state (ice).  The difference in density of comparing a gas to a liquid is that the gas is less dense than the liquid, therefore offering less resistance to your hand.
634933
Density and phase 0.626 g/cm3, liquid