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Why the molar specific heat at constant pressure is larger than the molar specific heat at constant volume?
Wiki User
∙ 15y ago
This question is wrong.
Heat capacity at constant pressure is more than that at constant volume.
And
Heat capacity at constant pressure - Heat capacity at constant volume= R
Cp - Cv= R ,where R is universal gas constant.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoThe specific heat at constant pressure is larger than the molar specific heat at constant volume because if heat is added to a system it not only heats up but expands in volume. Therefore the system is doing work against the external pressure and the heat is not only stored as kinetic and potential energy but is also required to perform work. In general more heat can be stored in a system at constant pressure than one at constant volume. The specific heat at constant pressure is larger than the molar specific heat at constant volume because if heat is added to a system it not only heats up but expands in volume. Therefore the system is doing work against the external pressure and the heat is not only stored as kinetic and potential energy but is also required to perform work. In general more heat can be stored in a system at constant pressure than one at constant volume.
Wiki User
∙ 12y agoThe heat capacity of a substance depends on how much heat energy can be stored in the motion of the substance's particles as well as the inter-molecular bond strengths holding the particles in their liquid/solid form.
As we are considering the same substance's heat capacity as we change the volume or pressure, we need only consider the heat energy stored in the motion of the particles. Note that this motion can be internal vibrational motion.
If the volume is increased there is a growing space and "states" to distribute the heat energy in the particles' motion.
The ideal gas law related pressure and volume to temperature : PV = nRT. With it we see that the pressure in inversely proportional to the volume. P = nRT/V
Therefore, if we increase the temperature and keep the pressure the same, we can only do this by increasing the volume. As mentioned before, this provides more "breathing room" for the particles to store the heat energy.
Wiki User
∙ 14y agono there is no any substance because Cp=R+Cv and R IS CONSTANT and can never be -ve
Wiki User
∙ 13y agoc_p = k/(k-1)*R, while c_v = 1/(k-1)*R, with k being the adiabatic index.
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If the pressure and number of particles are constant?
Then the specific volume varies directly with temperature.
What is the constant and the variables in Boyles law?
The constant k is a...constant specific for the system considered.
What is the gas law which has an inverse relationship between pressure and volume?
At constant temperature, the product of pressure and volume is a constant, or pressure is inversely proportional to volume, is known as Boyle's Law.
What can you say about pressure and volume according to boyles law?
For a given mass at constant temperature, the pressure time tghe volume is a constant. pV=C
What are the effects of temperature and volume of gas samples at constant pressure?
If the volume is constant, the density does not change with temperature. With increasing temperature there is still the same number of molecules confined to the same volume of space, so no difference in density.
Why Do Gasses Have Two Specific Heats?
One is for constant pressure, the other is for constant volume. These are not the same; for example, if the pressure is maintained constant, and the gas is heated, the volume changes.
What are thermodynamics?
Thermodynamic properties are specific volume, density, pressure, and temperature. Other properties are constant pressure, constant volume specific heats, Gibbs free energy, specific internal energy and enthalpy, and entropy.
Is water have specific heat at constant volume or not?
Yes it has! the specific heat of water at constant volume is given by cV : Heat capacity at constant volume cP : Heat capacity at constant pressure : Thermal expansion coefficient : Isothermal compressibility : Density
How does the volume and pressure change in a tire after a long drive?
The volume is constant. The pressure will increase.The volume is constant. The pressure will increase.
If the pressure and number of particles are constant?
Then the specific volume varies directly with temperature.
What are the properties of mass?
Density Specific Volume Pressure Temperature Viscoisy Gas Constant Heat Specific
Why we use two type of molar specific heat?
For gases, there is heat specific heat capacity under the assumption that the volume remains constant, and under the assumption that the pressure remains constant. The reason the values are different is that when heating up a gas, in the case of constant pressure it requires additional energy to expand the gas. For solids and liquids, "constant volume" isn't used, since it would require a huge pressure to maintain the constant volume.
When does raising the temperature of gas increase its pressure?
Increasing the temperature of a gas will increase it's pressure ONLY if the volume is held constant.
What two variables are compared in Boyles law?
1. A more correct name is Boyle-Mariotte law, because also Mariotte discovered independently the law.. 2. This law is a relation between pressure and volume at constant temperature. The equation is: pV = k where p is the pressure, V is the volume, k is a constant specific for the system.
What relationship does Boyle and Law describe?
1. A more correct name is Boyle-Mariotte law. 2. This law is a relation between pressure and volume at constant temperature. The equation is: pV = k where p is the pressure, V is the volume, k is a constant specific for the system.
What is the constant and the variables in Boyles law?
The constant k is a...constant specific for the system considered.
When the temperature is constant will the the volume of a gas decrease as the pressure decreases?
At constant temperature p.V=constant, so pressure INcreases when decreasing the volume.
