Measuring density is very important for many different industries because the density measurement will help determine the characteristics of a material, for example, whether the material will float or sink. Knowing the density of a material helps in determining the mass and volume of a material, all of which are extremely important measurements in all industries.
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Yes because I went through college and learned this
        
                    
             
        
        
        
Answer : 
B 
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Second one i think.......