![]() So what you learned there applies here.įinding mass is usually straightforward. In Lab 1 you learned how to find volume and mass, now we just do the division. ![]() This is the same as water, which makes sense because Diet Coke is essentially just water.Īgain, to find density you only need two measurements, volume and mass. (2.2 lbs.) So the density is 1000 grams change in mass per 1 liter change in volume, which is the same as 1000 grams per 1000 milliliters (cubic centimeters), which is the same as 1 gram per 1 cubic centimeter (1 cm 3).ġ000 g = 1000 g = 1000 g ÷ 1000= 1 gram = 1g/cm 3 If you change the volume of Diet Coke from 1 liter to 2 liters, the change of volume is also 1 liter, but the change in mass is only 1000 grams. It also lets us find the mass if we know the volume. This is allows us to find the volume if we know the mass. You can also interpret this as for every 19.3 grams of gold, there will be 1 cm 3 volume of gold. It is telling us that for every 1 cm 3 volume change there will be 19.3 grams of mass change. The volume is usually just one of whatever the volume is measured in. This is the way we normally see it written. So the above fraction is reduced by dividing top and bottom by 1000. Since one liter is 1000 cm 3 we could write:ĭensity is almost always shown as the mass of one unit of the volume. Mixing English units with metric units is not normally done, so we would write In mathematical language, that's written as a fraction. So you could express the density as 42 lbs mass change for every 1 liter of volume change. So there was a change in mass of 19,300 grams (that's 42 lbs!). For example with gold, if the change of size goes from 1 liter to 2 liters, the change in size is just 1 liter, however, its mass increased from 19,300 grams to 38,600 grams. If something gets a lot heavier when there's just a small change in volume, then it has a high density. That's why you see water trucks work with the compaction equipment like sheep-foot rollers (shown here).ġ liter of gold changing to 2 liters of gold causes a change in mass of 42 pounds.ĭensity tells us how much mass changes when volume changes. These devices can also be used with juices and other liquids to determine their density.Ĭompaction of soil for roads, dams, and building foundations.įor soil to reach the highest compaction (highest density), it needs water present while it's being compacted. A specific gravity above 1.035 indicates a problem. These devices only need a drop of urine to do the testing. The computer chip in the devices translate the degrees the light bends into density (specific gravity) of the urine. This is done with refractometers (2 examples are shown). This is the same kind of instrument used to measure the charge of a battery (by measuring sulfuric acid density).Īnother way the density of urine is determined is by measuring how much it bends light (refracts light). The density is read on a scale on the tube. The more the inner tube extends above the surface of the urine, the more dense the urine is. Urine density can be done using a hydrometer, which uses a floating tube (Left image). When a battery is fully charged, the sulfuric acid solution is at its highest density. The higher it floats, the more dense the acid solution. The hydrometer's inner tube will then float to a certain level. The sulfuric acid solution is drawn up into the hydrometer using the squeeze bulb at the top. Sulfuric acid in batteries is quite corrosive, so the hydrometers for testing batteries are enclosed (see right image). It is just the ratio of density of the measured liquid to the density of water. This means the brownish liquid (beer in this case) is 1.035 times more dense than water. On the left you read the density marking at the water level. If the density is low, the inner tube will sink more. If density of the water solution is high, then the inner tube will float higher. ![]() The hydrometer often uses a tube that floats inside of another tube. The common instrument to measure density of an aqueous (water) solution is with a hydrometer ( water+meter). The density of the sulfuric acid solution in the battery indicates how charged it is. Density is used in many more disciplines.īattery charge. In this lab you will apply density in the fields of mineralogy, archaeology, and forensics.
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