The freezing point of water goes down when it
has added salt to it. This means that the water
will freeze at a lower temperature. The normal
freezing point of water is 32degrees F. This
means that if it is 32 degrees out or lower, the
water on the sidewalks will be ice. If you add
salt to this, the freezing point lowers, and so
even at lower temperatures the water won't
freeze. This means that even if it is 32 degrees
outside, the salty water will not freeze.
Salty water freezes and melts at a lower
temperature. For example, water normally freezes
at 0 Celsius (32 Fahrenheit). With a lot of salt
added, the freezing point might be something like
-10 Celsius (14 Fahrenheit) instead. If the
temperature outside is -5 Celsius (23 Fahrenheit),
the salty ice would be above its freezing point
and will melt.
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