What does a polytropic process with n 1 represent?
1 Polytropic Process. where v = 1 / ρ is the specific volume, n is the polytropic index, and C is a constant. The condition of represents an isobaric process, represents an isothermal process, n = γ = c p / c v represents an isentropic process, and represents an isochoric process.
How do the pressure and volume change during expansion?
Decreasing the volume of a contained gas will increase its pressure, and increasing its volume will decrease its pressure. In fact, if the volume increases by a certain factor, the pressure decreases by the same factor, and vice versa. Volume-pressure data for an air sample at room temperature are graphed in Figure 5.
Is pressure times volume energy?
In engineering applications, the units of P-V energy, also called flow energy, are the units of pressure times volume (pounds-force per square foot times cubic feet), which equals foot-pounds force (ft-lbf). The specific P-V energy of a substance is the P-V energy per unit mass.
What is the formula for pressure volume work?
Because pressure is constant, the work done is PΔV . Recall that the formula for work is W=Fd. We can rearrange the definition of pressure, P=FA, to get an expression for force in terms of pressure. 12.4W=PAd.
How do you convert pressure to volume?
First, let’s review the ideal gas law, PV = nRT. In this equation, ‘P’ is the pressure in atmospheres, ‘V’ is the volume in liters, ‘n’ is the number of particles in moles, ‘T’ is the temperature in Kelvin and ‘R’ is the ideal gas constant (0.0821 liter atmospheres per moles Kelvin).
What does pressure times volume give you?
For a fixed mass of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle’s law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases and vice versa, when the temperature is held constant.
Why does pressure decrease when volume increases?
The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.
Does work equal pressure times volume?
For a gas, work is the product of the pressure p and the volume V during a change of volume. On a graph of pressure versus volume, the work is the area under the curve that describes how the state is changed from State 1 to State 2.
Does the piston move in or out?
As the gas heats up, its pressure should rise, which in turn displaces the piston in the outward direction. This is positive work, i.e. work being done by the system. Since the piston moves out, the gas mixture does work on ts surroundings.
When work is done is transferred or stored?
The total amount of energy is constant. You know that energy is transferred when work is done. No matter how energy is transferred or transformed, all of the energy is still present somewhere in one form or another.
Is the rate at which work is done or energy is transferred?
power: A measure of the rate of doing work or transferring energy. watt: In the International System of Units, the derived unit of power; the power of a system in which one joule of energy is transferred per second.
What is the rate in which work is done?
The rate at which work is done is called power. It is expressed as the amount of work per unit of time.
What are the two factors that affect kinetic energy?
1. Explain that there are two factors that affect how much kinetic energy a moving object will have: mass and speed. Have students complete this demonstration to learn how mass influences an object’s kinetic energy. 2.
What factors affect the energy of the ball?
Gravitational Potential Energy is determined by three factors: mass, gravity, and height.
What factors do you think affect an object’s kinetic energy?
What factors affect an objects kinetic energy and potential energy? The kinetic energy of an object depends on both its mass and its speed. Kinetic energy increased as mass and speed are increased.
What factors does the kinetic energy of an object depend on?
The amount of translational kinetic energy (from here on, the phrase kinetic energy will refer to translational kinetic energy) that an object has depends upon two variables: the mass (m) of the object and the speed (v) of the object.
Does the kinetic energy of an object depends on its direction of motion?
The kinetic energy of an object is the energy it has because of its motion. Note that energy is a scalar quantity, i.e., it does not depend on direction, and it is always positive. When we double the mass, we double the energy; however, when we double the velocity, energy increases by a factor of four.