How do density and pressure creates things strong
Answers
It is unrelated to pressure, and pressure is unrelated to density. Pressure generally increases with temperature only in a gas with a constant volume. ... If there were no container, an increase in temperature would cause the molecules to fly apart. Now there are less molecules per unit of volume, so the density is lower.
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Answer:
Pressure is a scalar quantity defined as force per unit area. Pressure only concerns the force component perpendicular to the surface upon which it acts, thus if the force acts at an angle, the force component along the direction perpendicular to the surface must be used to calculate pressure.
The pressure exerted on a surface by an object increases as the weight of the object increases or the surface area of contact decreases. Alternatively the pressure exerted decreases as the weight of the object decreases or the surface area of contact increases.
Pressure exerted by ideal gases in confined containers is due to the average number of collisions of gas molecules with the container walls per unit time. As such, pressure depends on the amount of gas (in number of molecules), its temperature, and the volume of the container.
Key Terms
ideal gas: Theoretical gas characterized by random motion whose individual molecules do not interact with one another and are chemically inert.
kinetic energy: The energy associated with a moving particle or object having a certain mass.
Pressure is an important physical quantity—it plays an essential role in topics ranging from thermodynamics to solid and fluid mechanics. As a scalar physical quantity (having magnitude but no direction), pressure is defined as the force per unit area applied perpendicular to the surface to which it is applied. Pressure can be expressed in a number of units depending on the context of use.
Pressure and Pascal’s Principle: A brief introduction to pressure and Pascal’s Principle, including hydraulics.
Units, Equations and Representations
In SI units, the unit of pressure is the Pascal (Pa), which is equal to a Newton / meter2 (N/m2). Other important units of pressure include the pound per square inch (psi) and the standard atmosphere (atm). The elementary mathematical expression for pressure is given by:
pressure
=
Force
Area
=
F
A
where p is pressure, F is the force acting perpendicular to the surface to which this force is applied, and A is the area of the surface. Any object that possesses weight, whether at rest or not, exerts a pressure upon the surface with which it is in contact. The magnitude of the pressure exerted by an object on a given surface is equal to its weight acting in the direction perpendicular to that surface, divided by the total surface area of contact between the object and the surface. shows the graphical representations and corresponding mathematical expressions for the case in which a force acts perpendicular to the surface of contact, as well as the case in which a force acts at angle θ relative to the surface.
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