The unit of power in S.I. units is
Power is measured in Watts.
Work done in a free expansion process is
During free expansion, no work is done by the gas. The gas goes through states of no thermodynamic equilibrium before reaching its final state, which implies that one cannot define thermodynamic parameters as values of the gas as a whole. So work done in a free expansion process is Zero.
An open system is one in which
An open system is a system that freely exchanges energy and matter with its surroundings.
Which of the following variables controls the physical properties of a perfect gas
Perfect gas, also called ideal gas, a gas that conforms, in physical behaviour, to a particular, idealized relation between pressure, volume, and temperature called the general gas law. This law is a generalization containing both Boyle’s law and Charles’s law as special cases and states that for a specified quantity of gas, the product of the volume v and pressure p is proportional to the absolute temperature t; i.e., in equation form, pv = kt, in which k is a constant. Such a relation for a substance is called its equation of state and is sufficient to describe its gross behaviour.
Which of the following laws is applicable for the behaviour of a perfect gas
Boyle's Law
a law stating that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
Charle's Law
a law stating that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature.
GayLussac's Law
law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.
According to kinetic theory of gases, the absolute zero temperature is attained when
The average kinetic energy of gas molecules is directly proportional to absolute temperature only; this implies that all molecular motion ceases if the temperature is reduced to absolute zero.
According to GayLussac law for a perfect gas, the absolute pressure of given mass varies directly as
GayLussac's Law
Tlaw states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.
Gas laws are applicable to
Because density of gas and vapour are diferent
According to Dalton's law the total pressure of the mixture of gases is equal to
Dalton's law (also called Dalton's law of partial pressures) states that in a mixture of nonreacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.
A closed system is one in which
In nonrelativistic classical mechanics, a closed system is a physical system that doesn't exchange any matter with its surroundings, and isn't subject to any net force whose source is external to the system. A closed system in classical mechanics would be considered an isolated system in thermodynamics.
Superheated vapour behaves
The value of n = 1 in the polytropic process indicates it to be
PV^{γ} = constant
is the expression for Polytropic Process where γ is a constant
If γ = 1, PV = constant which is only true for an isothermal process.
Hence option C is correct.
A piston cylinder contains 0.5 kg of air at 500 kPa and 500 K. The air expands in a process so pressure is linearly decreasing with volume to a final state of 100 kPa and 300 K. Find the work in the process.
Gases have
The specific heats of gases are given as Cp and Cv at constant pressure and constant volume respectively while solids and liquids are having only single value for specific heat.
According to Avogadro's Hypothesis
Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
The pressure of a gas in terms of its mean kinetic energy per unit volume E is equal to
Pressure in terms of kinetic energy per unit volume: The pressure of a gas is equal to twothird of kinetic energy per unit volume of the gas.
P = 2E/3
Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to
Kinetic energy of molecules is the form of internal energy in a closed vessel, and internal energy is the function of temperature so kinetic energy of molecules is proportional to absolute temprature
One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
2CO + O_{2} = 2 CO_{2}
(2*28) (16*2) (2*44)
=56 kg =32 kg =88 kg
=1 kg =32/56 kg =88/56 kg
=1 kg =4/7 kg =11/7 kg
That is 4/7 kg of O_{2} is required for preaparing 11/7 kg of CO_{2} from 1 kg CO.
Absolute zero pressure will occur
The absolute zero pressure will be when the molecular momentum of the system becomes zero. ... Thus, Pressure P = F/A = Rate of change of momentum/Area. Now when the ''rate of change of momentum' is zero, the above equation becomes: P = 0 / area = 0 which is the absolute zero pressure.
No liquid can exist as liquid at
Liquids are volatile. If taken to zero pressure which effectively means vacuum, in that case, it will boil and vapourise. While different liquids have different viscosity but eventually it will vapourise as there is no pressure to help it maintain the viscosity and surface tension. Water will vapourise much faster than say mercury.
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at. a temperature of  273.16°C. a temperature of 0°C.
Specific heat of air at constant pressure is equal to
For ordinary calculations  a value of specific heat c_{p} = 1.0 kJ/kg K (equal to kJ/kg ^{o}C) or 0.24 Btu(IT)/lb °F  is normally accurate enough
Characteristic gas constant of a gas is equal to
We know by the formula C_{p}  C_{v} = R
The behaviour of gases can be fully determined by
Avogadro's Law states that equal volumes of all ideal gases (at the same temperature and pressure) contain the same number of molecules.
Boyle's Law states that equal pressure is inversely proportional to volume (when temperature is constant).
Charles's Law states that volume is proportional to temperature (when pressure is constant). Remember that temperature must be measured in Kelvin.
GayLussac's Law states that pressure is proportional to temperature (when volume is constant).
To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is
To convert volumetric analysis to gravitational analysis, relative volume of each constituent of flue gases is multiplied by its molecular weight.
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