Water molecules go from where there are more
water molecules to where there are fewer water
molecules. That's what molecules do, if they
are free to move. You can do an experiment by
putting a drop of food color into a glass of water
and watching the food color molecules move from
where there are a lot of them to where there are
not a lot of them. What happens to the food
color if you wait a long time?
A fresh marshmallow will have more water than
the air, unless the air is quite moist. That's
what you're thinking, when you write about water
moving out of the marshmallow.
I'm guessing stale marshmallows are just those
that have lost water. My son's marshmallows are
gooey, and they stick together. He says they come
from the store that way.
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