“It is
already getting too hot. It is mid-March and it feels like we are up for a super-hot
summer. I am already thinking of monsoons.”, said my mom in a casual
conversation. My sister, who was visiting us with her daughter, raised another
point. “Monsoons are just as worse with all the potholes on the road and
traffic jams all around.”, she has a valid point. The conversation took a
different direction and we started discussing what we don’t like about rainy
season. I and my father were in complete agreement with my sister about the
potholes and traffic jam as we were the most impacted people in the family by
these.
However, my
six-and-a-half-year-old niece who loves to play in the rains and has her own
dedicated driver (read her father) has a completely different problem for rainy
season. She was busy with her coloring book and without raising her head, she
said in her cute voice, “Baarish mein namak nahi nikalta dibbi se” (the salt
does not come out of sprinkler in rains). Well, my sister was visibly happy at
her daughter’s observation and intelligence and everyone in the family was
impressed.
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Salt is a hygroscopic substance |
A genuine
monsoon problem, right? The salt in the sprinkler on the table turns to lumps. Let
us try to understand the reason behind this.
The reason
corresponds to a phenomenon of a substance attracting the water molecules from
the atmosphere and normal room temperatures. This is known as “Hygroscopy” and
the substances that attract or absorb the water from atmosphere are known as hygroscopic.
The hygroscopic
substances, when absorbing the water from atmosphere, might change physically a
little. For example, the salt changes from its powder form to lump form. This is
because the salt is so hygroscopic that it tends to get dissolved in the water
it attracts from atmosphere.
Though
causing a problem to my niece (and to us as well), this property of hygroscopy
is helpful at times as well. The hygroscopic substances are added to some food
products to maintain the moisture content.
Nerd Note 1: A hygroscopic substance added to other material for purpose of maintaining moisture
content is called humectant.
Nerd Note
2: the property of a substance of dissolving easily in the water they absorb
from atmosphere is called deliquescence.
Nerd Note
3: Some more example of such substances are: concentrated sulfuric acid, cotton,
paper, and many chloride salts.
Nerd Note 4:
Hygroscopic sounds very similar to the word hydroscopic which is completely
unrelated. Hydroscope is an optical device. Tell us in comments if you know
what it is used for.
So, next
monsoon, when you see someone struggling to sprinkle salt on their food, smile
silently because now you know why.
And as
always, thanks for reading.
Ayush!!!
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