Selina Concise ICSE Solutions For class 8 Physics chapter 2 – Physical Quantities and Measurement • MASS Is the quantity of matter contained in a body. VOLUME is the space occupied by body. • Equal mass of IRON and cotton, iron will have less volume than cotton. • Equal volume of Iron and cotton, the mass of iron is more than mass of cotton, because iron denser than cotton. • DENSITY “Is ratio of mass of substance to volume of substance” D = M/V = KG/M3The SI. unit of density is kg M-3 • Density of a substance does not change with change in shape or size. • When a substance is heated it expands and volume increases. Hence density decreases. Water has maximum density at 4°C i.e. density of water increases from 0°C to 4°C and decreases above 4°C. • Volume of substance is measured by formula V = L × B × H or 4/3 or by measuring cylinder. • Mass is measured by beam balance or spring balance. • RELATIVE DEN...
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