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Density Of Liquids And Solids

            
             Density is the amount of a substance contained within a specific area. Density is the mass divided by its volume and is expressed in units like grams per cubic centimeter or pounds per cubic foot. Density measured in units of g/ml is also known as specific gravity. Specific gravity is defined as the density of a given object divided by the density of pure water at 4?C. Because the density of pure water at 4?C is exactly one g/ml, the specific gravity of an object is simply its density divided by 1 g/ml.
             Density can be measured in lots of ways. Solids are weighed to determine its mass then put in water to measure the volume. From that point its mass and volume are divided to give you the density of the solid. .
             To find the mass of a liquid you must first measure the container that you are going to put the liquid in. Put the liquid in the container and find the measurement. Subtract the weight of the container and you will have the mass of the liquid. The volume of a liquid can be determined by something as simple as a measuring cup used for cooking. From that point you would use the same method for liquids as you would for solids.
             Hydrometers are used to measure specific density of liquids. Some hydrometers are enclosed in a glass tube held with a lead weight or mercury. When immersed the graduated stem rises vertically to give a measurement. .
             .
             An example in determining the density of a solid is to get a graduated cylinder and a rubber stopper and following this procedure:.
             1. Get a rubber stopper and a graduated cylinder.
             2. Wash the stopper to remove dirt, dust, etc.
             3. Let it dry and then find its mass by using a triple beam balance.
             4. Put enough water in the cylinder that is higher than the stopper.
             5. Turn the cylinder at an angle when you drop stopper so it doesn't splash.
             6. Record the volume of the stopper.
             7. Now by using the density formula D=m/v you will get the density.
             An example of finding the density of a liquid is to get a graduated cylinder and a triple beam balance.


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