What is the definition of pressure quizlet?

Asked By: Abderahmane Salegui | Last Updated: 28th January, 2020
Category: science chemistry
5/5 (19 Views . 44 Votes)
Pressure is equal to the force exerted on a surface divided by the total area over which the force is fluid exerted. Pressure increases as you go deeper into water. more water means more pressure.

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Consequently, what is the correct definition of pressure?

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure, and the torr is defined as ?1760 of this.

Subsequently, question is, what is described as the collision of the molecules? The collision theory explains that gas-phase chemical reactions occur when molecules collide with sufficient kinetic energy. The collision theory is based on the kinetic theory of gases; therefore only dealing with gas-phase chemical reactions are dealt with. All molecules are rigid spheres.

Also to know, what causes pressure chemistry quizlet?

Pressure is inversely proportional to volume, or higher volume equals lower pressure. Pressure is directly proportional to temperature, or higher temperature equals higher pressure.

What causes fluid pressure?

Fluid pressure is a measurement of the force per unit area. Fluid pressure can be caused by gravity, acceleration, or forces in a closed container. Pressure increases because as you go deeper, fluid at a lower depth has to support fluid above it as well.

31 Related Question Answers Found

Is pressure a force?

Pressure. Pressure is defined as force per unit area. It is usually more convenient to use pressure rather than force to describe the influences upon fluid behavior. The standard unit for pressure is the Pascal, which is a Newton per square meter.

What are the types of pressure?

The different types of pressure are differentiated only by the reference pressure.
  • Absolute pressure. The clearest reference pressure is the pressure zero, which exists in the air-free space of the universe.
  • Atmospheric pressure.
  • Differential pressure.
  • Overpressure (gauge pressure)
  • Contact us.

What are some examples of pressure?

A simple example of pressure may be seen by holding a knife to a piece of fruit. If you hold the flat part of the knife against the fruit, it won't cut the surface. The force is spread out of a large area (low pressure).

How do you find the pressure?


Pressure and force are related, and so you can calculate one if you know the other by using the physics equation, P = F/A. Because pressure is force divided by area, its meter-kilogram-second (MKS) units are newtons per square meter, or N/m2.

What are the applications of pressure?

The air filled in car tires lifts the whole car weight. "Sucking a drink" through a straw -" fluid flows because" of the pressure difference. The flying of aircraft due to the "pressure on the wings". "Small bullet fired" from a gun" with pressure.

How is pressure created?

The rapid motion and collisions of molecules with the walls of the container causes pressure (force on a unit area). Pressure is proportional to the number of molecular collisions and the force of the collisions in a particular area. The more collisions of gas molecules with the walls, the higher the pressure.

What is the verb form of pressure?

pressure someone into (doing) something: Don't be pressured into making any rash decisions. pressure someone to do something: Officials had pressured her to lie about the affair.

pressure ?Definitions and Synonyms.
present tense
past tense pressured
past participle pressured

What units are used to express pressure measurements quizlet?


The three units used to express pressure are pascal (Pa), atmosphere (atm), and Hg (torr). Convert one atmosphere to millimeters of mercury. 1 atm is 760 mm torr.

What are the two characteristics of an effective collision?

The collision energy must be greater than the activation energy for the reaction. The collision must occur in the proper orientation. The collision frequency must be greater than the frequency factor for the reaction. A collision between the reactants must occur.

Which type of reaction does not require a collision between two different molecules to proceed?

Which type of reaction does not require a collision between two different molecules to proceed? A unimolecular reaction only involves a single reactant molecule, which will decompose into fragments if it has sufficient kinetic energy. This will not require a collision with a different molecule to occur.

What are the two things that must take place in order for a reaction to take place between molecules or atom?

Conclusion. According to the collision theory, the following criteria must be met in order for a chemical reaction to occur: Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation.

What happens when gas molecules collide?

Collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved. Collisions are not “sticky". The average kinetic energy of the gas molecules is directly proportional to the absolute temperature.

What must happen in order for two molecules to react?


According to the collision theory, the following criteria must be met in order for a chemical reaction to occur: Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation.

How do you calculate collision frequency?

Explanation: According to Kinetic Molecular Theory, the collision frequency is equal to the root-mean-square velocity of the molecules divided by their mean free path. If the molecules have diameter d, then we can use a circle of diameter σ=2d to represent a molecule's effective collision area.

What is collision number in chemistry?

Collision number is defined as the "number of collisions" per unit time. A collision is an interaction between two or more bodies in motion. When one molecule involved, the average number of collisions per unit time nearly one second per moles of reactant between reacting molecules is called collision number."