Short-Answer Questions
1. Define volume. Write its SI unit.
2. What is meant by the density of a body?
Write the SI unit of density.
3. What is the relative density of a substance?
What is its SI unit?
4. What is the weight of a body? What is the SI
unit of weight?
5. What is the relation between mass and
weight?
6. What is the relative density of water?
Answers
1.Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic metre.
Answer:
1.Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic metre.
2.All SI units follow the rule that they have to derive from the SI units of the corresponding magnitudes. Therefore, since Density = Mass / Volume, the unit of density is the unit of mass(kg) per unit of volume(m³). ... (The ratio of the weight of the substance to the weight of an equal volume of water.)
3.The S.I. unit of density kg/m³. Relative density is the ratio of the density of a substance with the density of water.
4.The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon.
5.The mass of an object is a measure of the object's inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s2.
6.In SI units, the density of water is (approximately) 1000 kg/m3 or 1 g/cm3, which makes relative density calculations particularly convenient: the density of the object only needs to be divided by 1000 or 1, depending on the units.