F. Answer the following in short.
1. Write the order in which the density decreases in three states of matter.
2. Explain briefly the construction of a hydrometer.
3. Define the relative density of a substance. Why does relative density have no units?
4. Why is a Plimsoll line a safety requirement for ships?
5. Write the factors that determine whether a solid will float or sink in a liquid.
6. Explain how the density of a substance varies with change in temperature.
Answers
Answer:
HOPE YOU UNDERSTAND AND FOLLOW :-
Explanation:
1). Density means how much dense or rigid the particles in a matter are.
- A solid is denser than the liquid and a liquid is denser than the gas.
- Thus the decreasing order of density should be solid, liquid, gas.
2). A hydrometer usually consists of a sealed hollow glass tube with a wider bottom portion for buoyancy, a ballast such as lead or mercury for stability, and a narrow stem with graduations for measuring. ... The point at which the surface of the liquid touches the stem of the hydrometer correlates to relative density.
3). Relative density has no unit because it is the ratio of same units which gets cancelled. Answer: ... Relative density = Density of the substance/Density of water at 4°C. As both the numerator and the denominator on the RHS of the above formula has the same unit (i.e. kg/m3) they get cancelled.
4). Merchant ships have a marking on their hulls known as the Plimsoll line or the Plimsoll mark, which indicates the limit until which ships can be loaded with enough cargo.
5). Answer:-
- The density of an object determines whether it will float or sink in another substance.
- An object will float if it is less dense than the liquid it is placed in.
- An object will sink if it is more dense than the liquid it is placed in.
6). Density changes with temperature because volume changes with temperature. Density is mass divided by volume. As you heat something up, the volume usually increases because the faster moving molecules are further apart. Since volume is in the denominator, increasing the volume decreases the density.
Answer:
Answer 3. - Relative density has no unit because it is the ratio of same units which gets cancelled. Answer: ... Relative density = Density of the substance/Density of water at 4°C. As both the numerator and the denominator on the RHS of the above formula has the same unit (i.e. kg/m3) they get cancelled.
Answer 4. - Why is a Plimsoll line a safety requirement for ships? Answer: Merchant ships have a marking on their hulls known as the Plimsoll line or the Plimsoll mark, which indicates the limit until which ships can be loaded with enough cargo.
Answer 5. - The density of an object determines whether it will float or sink in another substance. An object will float if it is less dense than the liquid it is placed in. An object will sink if it is more dense than the liquid it is placed in.
Answer 6. - Density changes with temperature because volume changes with temperature. Density is mass divided by volume. As you heat something up, the volume usually increases because the faster moving molecules are further apart. Since volume is in the denominator, increasing the volume decreases the density.
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