19. Discuss briefly, how you will measure volume of an irregular object.
(a) Rock A has a volume of 15 cm3 and a mass of 45 g. What is its density?
(b) Rock B has a volume of 30 cm and a mass of 60 g. What is its density?
(c) Which rock is heavier?
(d) Which rock is denser?
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A:
The density of something is just the mass divided by the volume:
D = m/V
The mass you can measure on a balance or a scale, and the volume is the amount of space the object occupies. You can find the volume of an irregular object by immersing it in water in a beaker or other container with volume markings, and by seeing how much the level goes up.
You can use this relation backwards too -- if you know what material an object is made of, you can look up its density in a book. Measuring its mass allows you to compute the volume.
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