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71% of the earth is covered in water but
only 2% of that water is pure as clean
drinking water becomes more scarce you
may be wondering what happens if I drink
seawater let's first examine how our
bodies absorb water you may remember the
process of osmosis where water moves
from a less concentrated solution to a
more concentrated solution through a
semipermeable membrane the cell's
membrane allows water to pass through
but not the particles dissolved in water
like salt normally the saltiness of
water inside ourselves is the same as
the saltiness outside ourselves when you
drink water a concentration difference
takes place water from the outside of
your cell moves inside to maintain
balance this is called an isotonic state
when you drink too much seawater the
saltiness outside your cells will
increase rapidly and the cells force
water molecules out in order to restore
balance so even if you are already
dehydrated drinking seawater will cause
your cells to release more water and you
will end up peeing out more liquid than
you take in conversely if you chug a
massive amount of pure water the exact
opposite will happen the saltiness
outside your cells will decrease rapidly
and water will be forced into your cells
this can cause cells to swell and burst
which in extreme cases leads to seizures
coma and sometimes death so what can you
do if you are stranded on a deserted
island with absolutely no fresh water
around
the simplest way to extract fresh clean
water from the ocean is through
distillation which separates the salt
from the water in order to distill water
you must seek the seawater so it
evaporates then trap the evaporated
water vapour until it cools and
condenses back into liquid water kind of
like the moisture on your bathroom
mirror after a hot shower this condense
water will be free of all salt and be
100% safe to drink for more interesting
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