Question

Give reason
a)LPG is a better domestic fuel than wood.
b) goldsmith use the outermost zone of the flame for melting gold and silver
c) for any fuel to burn, it is to reach its ignition temperature.​

Answer 1

a LPG is more combustible and refined furl rather than wood.

b The outermost zone of flame which appears blue is the hottest one, hence it is used by goldsmiths for melting gold and silver.

c Each fuel has a ignition temperature and in order to burn it, that minimum temperature needs to be aquired.

Hope it helped u...

Answer 2

Question⤵️

1. LPG is a better domestic fuel than wood
2. goldsmith use the outermost zone of the flame for melting gold and silver
3. for any fuel to burn, it is to reach its ignition temperature.

Answers ⤵️

1. LPG has more calorific value than wood and LPG produces no pollution. So LPG is a better domestic fuel than wood.
2. A goldsmith uses the outer part of the candle flame for melting gold and silver. This is because in this zone of flame, the temperature is the highest helping these metals to melt easily.
3. Oxygen (in air) is essential for combustion. During the process of combustion, heat and light are given out. Ignition temperature is the lowest temperature at which a combustible substance catches fire. Inflammable substances have very low ignition temperature.