Pressureless

noun
1.
the exertion of force upon a surface by an object, fluid, etc., in contact with it:
the pressure of earth against a wall.
2.
Physics. force per unit area. Symbol: P.
Compare stress (def 6).
3.
Meteorology. atmospheric pressure.
4.
Electricity. electromotive force.
5.
the state of being pressed or compressed.
6.
harassment; oppression:
the pressures of daily life.
7.
a constraining or compelling force or influence:
the social pressures of city life; financial pressure.
8.
urgency, as of affairs or business:
He works well under pressure.
9.
Obsolete. that which is impressed.
verb (used with object), pressured, pressuring.
10.
to force (someone) toward a particular end; influence:
They pressured him into accepting the contract.
11.
pressurize.
noun
1.
the state of pressing or being pressed
2.
the exertion of force by one body on the surface of another
3.
a moral force that compels: to bring pressure to bear
4.
an urgent claim or demand or series of urgent claims or demands: to work under pressure
5.
a burdensome condition that is hard to bear: the pressure of grief
6.
the normal force applied to a unit area of a surface, usually measured in pascals (newtons per square metre), millibars, torr, or atmospheres p, P
7.
short for atmospheric pressure, blood pressure
verb
8.
(transitive) to constrain or compel, as by the application of moral force
9.
another word for pressurize

pressure pres·sure (prěsh’ər)
n.

The act of pressing or condition of being pressed.

A stress or force acting in any direction against resistance.

Force applied uniformly over a surface, measured as force per unit of area.

pressure
(prěsh’ər)
The force per unit area that one region of a gas, liquid, or solid exerts on another. Pressure is usually measured in Pascal units, atmospheres, or pounds per square inch. ◇ A substance is said to have negative pressure if some other substance exerts more force per unit area on it than vice versa. Its value is simply the negative of the pressure exerted by the other substance.

pressure definition

The force exerted on a given area. (See atmospheric pressure.)

Note: The most familiar measure of pressure is psi (pounds per square inch), used to rate pressure in automobile and bicycle tires.