Question

Water and kerosene is taken in beaker is shown in the figure.

(a) Identify A and B. Justify your answer.

(b) If petrol, diesel etc. catches fire, it is said that one should never try to extinguish it using water. Why?

Answer 1

i think this is answer ok thank you

Answer 2

The answer to the given questions are as follows:

(a) In the given figure A is Kerosene and B is Water.

• Water has a mass density of 1000 Kg/m³ whereas kerosene has a mass density of 810 Kg/m³.
• The heavier compound always sinks to the bottom of the beaker, while the lighter compound floats on top of the heavier compound.
• Therefore, kerosene (A) is floating on water (B) in the given figure.

(b) If petrol, diesel, etc. catches fire, it is said that one should never try to extinguish it using water because:

• In this scenario, the principle of lighter and heavier substances applies.
• The mass density of petrol and diesel is lower than that of water.
• When it catches fire and is doused with water, it will spread the flame even more.
• This is because water with a higher mass density sinks, allowing petrol or diesel to rise above the water's surface, allowing the fire to continue to burn.
• The flow of water mixed with fuel or diesel can spread the flames even further.
• As a result, water should not be used to put out the fire.