Introduction:
While watering the grass with a water hose, I tried to
use my finger to stop the water a few times, but it
didn't work. The water rushing out of the hose had too
much pressure. My friend told me that they don't have
this much pressure at their house. They live up the
hill, just a few blocks away. I tried their water hose
and could stop it by my hand. That showed me that water
pressure is not the same everywhere. I was thinking
about this for a while. First, I thought the diameter of
the pipe may be a factor, but that wasn't the case. I
checked them out and they both looked the same size. Thinking
about this experience raised many questions in my mind.
Now my questions are
why does water have pressure? Do all liquids have
pressure?
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How does the water
pressure change at different depths? How can we reduce or
increase water pressure? Can we use water pressure to do
something, such as lifting a car, breaking a tree, or digging
into the ground? Any of these questions can be the subject
of a science project.
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