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What is pressure in science?
Definition of Pressure in Chemistry, Physics, and Engineering

Pressure is defined as a measure of the
force applied over a unit area. Pressure is
often expressed in units of Pascals (Pa),
newtons per square meter (N/m or kg/
m·s ), or pounds per square inch. Other
units include the atmosphere (atm), torr,
bar, and meters sea water (msw).
In equations, pressure is denoted by the
capital letter P or the lowercase letter p.
Pressure is a derived unit, generally
expressed according to the units of the
P = F / A
where P is pressure, F is force, and A is area
Pressure is a scalar quantity. meaning it has
a magnitude, but not a direction. This may
seem confusing since it's usually obvious
the force has direction. It may help to
consider pressure of a gas in a balloon.
There is no obvious direction of the
movement of particles in a gas. In fact, they
move in all directions such that that the net
effect appears random. If a gas is enclosed
in a balloon, pressure is detected as some
of the molecules collide with the surface of
the balloon. No matter where on the
surface you measure the pressure, it will be
the same.
Usually, pressure is a positive value.
However, negative pressure is possible.

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