Shikha’s family has a LPG connection in her home. When her mother was preparing breakfast for the family, the gas cylinder got empty. Shikha’s father brought the spare cylinder from the store room and replaced the cylinder. Just than Shika came running in the kitchen and told her mother that she can smell gas in her bedroom. Shika immediately closed the gas supply by turning off the cylinder knob. She told her mother not to use the leaking cylinder till the leakage is corrected. She also opened the window of the kitchen to let the leaked gas move out. Shika called the distributor and complained about the leakage. The gas mechanic came and changed the defective connecting pipe. There was no leakage now. Mother was very happy that Shika’s timely action has saved them
from a potentially dangerous situation.
a) Why does cooking gas has such a strong smell?
b) What is the full form of LPG?
c) What is the name given compressed gas?
d) Give one use of Compressed gas.
e) How could Shika detect the leakage at a distance?
f) Name the physical process that helps the gas to spread around
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Answer:
(a) (i) Ethyl mercaptan.
(ii) Strong smell of ethyl mercaptan
(b) Diffusion (in gases).
(c) The spreading out and mixing of a gas with another gas due to the motion of their particles is called diffusion in gases.
(d) The leaking cooking gas containing the strong smelling substance ethyl mercaptan spreads and mixes with the surrounding air by the process of diffusion. When the air containing ethyl mercaptan reaches our nose, we can smell it and come to know of the gas leakage.
(e) LPG is a highly inflammable gas (which catches fire very easily) If Mrs. Chopra had continued to use the leaking LPG cylinder, then a lot of LPG would have collected in the kitchen after some time. This collected LPG could ignite on coming in contact with gas stove flame causing a fire in the kitchen. Even the LPG cylinder could catch fire and burst causing a big explosion. This could lead to the loss of life and property.
(f)The various values displayed by Vibha in this episode are
(i) Good smelling power (so as to smell leaking cooking gas ever from a distance)
(ii) Knowledge of the risks of using a leaking LPG Cylinder
(iii) Responsible citizen (in calling distributor to rectify gas leakage), and
(iv) Desire to protect her family and property (from any LPG related accident).
Answer:
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