#### thermodynamics - Enthalpy change defined at constant ...

Is change in enthalpy defined only at constant pressure? I know Q-W=del(U) And Q at constant pressure equals del(H) (enthalpy change). Can Q (heat given to the system) be used interchangeably ...

#### Department of Chemistry Indian Institute of Technology Madras

An ideal monatomic gas at 1 atm pressure with a heat capacity at constant volume C v =3R/2 is expanded adiabatically against a constant external pressure of …

#### Thermodynamics - Topics

When we hold temperature and pressure constant we get: [Delta G = Delta H - TDelta S ] We typically are getting the (Delta X)'s in the above equation from Standard Thermodynamic Data Tables like you have in Appendix 4 in your textbook.

#### Confusion regarding Thermodynamics - Molar Specific …

2010-09-17· The equation Q = nC p ΔT should work for a constant pressure process unless you used an incorrect value for C p. In your "attempt for a solution" you don't specify what you used for C.

#### Thermodynamics/The First Law Of Thermodynamics – …

Common forms of the equation of state of an ideal gas: PV = nR u T PV = mRT where n is the number of moles, R u is the universal gas constant, and R is the specific gas constant. The universal and specific gas constants are related as follows: R=R u /M, where M is the molecular weight of the gas.

#### Heat Capacity at Constant Volume Q nCV Δ T For an ideal ...

This is from the extra 2 or 3 contributions to the internal energy from rotations. Because Q = Δ Eint when the volume is constant, the change in internal energy can always be written: Δ Eint = n CV Δ T Heat Capacity at Constant Pressure For an ideal gas at constant pressure, it takes more heat to achieve the same temperature change than it ...

#### Why specific heat at constant pressure is greater than ...

Specific heat at constant pressure represents the heat supplied to a unit mass of the system to raise its temperature through 1K, keeping the pressure constant. Since, P= Constant, dV > 0 and the work done by the system, W = PdV > 0. The first law of thermodynamics says: Q = (dU+W) = (dU+PdV) > dU.

#### Basic Thermodynamics Goals The ideal gas - Oxford Physics

Here pis the pressure, V the volume, nthe amount of substance (in mols), T the temperature, Rˇ8:314J=(mol K) the ideal gas constant, U the internal energy, and C

#### Nerve conduction velocity - Wikipedia

Nerve conduction velocity is an important aspect of nerve conduction studies. It is the speed at which an electrochemical impulse propagates down a neural pathway . Conduction velocities are affected by a wide array of factors, including age, , and various medical conditions.

#### Steam, saturated, overheated, wet, heat, dry, thermal ...

The effective pressure or relative pressure is the pressure measured above the atmospheric pressure and read on the ordinary gauges pressure. Absolute pressure: Absolute pressure = Gauge pressure + Atmospheric pressure (Atmospheric pressure at 1.01325 bar, i.e. normal atmospheric pressure on the sea level at 0°C).

#### ncv at constant pressure - schievelavabojourdan.be

Entropy of a Gas - Glenn Research Center. May 05, 2015· Thermodynamics is a branch of physics that deals with the energy and work of a system. In aerodynamics, we are most interested in thermodynamics in the study of propulsion systems and understanding high speed flows.

#### Relation between constant-pressure and constant …

Derivation: Difference between constant volume and constant pressure heat capacities (general case) However, as my contribution to this discussion I would like to derive a relation between heat capacities that is universally true for any substance, not just a perfect gas.

#### C = Q/ T = dQ/dT [J/deg] - people.ia.EDU

The constant value of the heat capacity of many simple solids is sometimes called Dulong – Petit law In 1819 Dulong and Petit found experimentally that for many

#### Computation, lower, calorific, value, GVC, NCV, gas, fuel ...

The calorific value of a fuel is the quantity of heat produced by its combustion, at constant pressure and under the conditions known as " normal " of temperature and pressure (i.e. to 0°C and under a pressure …

#### NCV | legal definition of NCV by Lawinsider.com

In addition to any other defined terms herein, the following terms used in this Agreement shall have the following meanings: Actual NCVcp means NCV of a Shipment at constant pressure as received.

#### Relation between constant-pressure and constant-volume ...

Derivation: Difference between constant volume and constant pressure heat capacities (general case) However, as my contribution to this discussion I would like to derive a relation between heat capacities that is universally true for any substance, not just a perfect gas.

#### Kinetic Theory of Gases? | Yahoo Answers

2010-04-05· When to use Q = nCvT or Q = nCpT. Example in this question A 1mol sample of hydrogen gas os heated at constant pressure 300K to 420K. Calculate [a] the energy transferred to the gas by heat [b] the increase in its internal energy In question [a] i know that use equation q = nCpT then why in question [b] use q = nCvT ...

#### Why in constant pressure process, the change in internal ...

Note that I did not use the constant pressure term - because the first equation is general. At constant pressure - you usually use Enthalpy for calculations, because the variation of Enthalpy is the heat variation - a easily measurable quantity.

#### Kinetic theory of gases: degrees of freedom problem ...

2011-09-22· Consider a sample containing 1.55 mol of an ideal diatomic gas. (a) Assuming the molecules rotate but do not vibrate, find the total heat capacity of the sample at constant volume. nCv = _____ J/K (b) Assuming the molecules rotate but do not vibrate, find the total heat capacity of the sample at constant pressure. nCp ...

#### CALORIFIC VALUE DETERMINATION OF SOLID BIOMASS FUEL BY ...

14918 defines NCV at a constant pressure as the ab-solute value of the specific heat (enthalpy) of combus-tion, in joules, for unit mass of the biofuel burned in oxygen at constant pressure under such conditions that all the water of the reaction products remains as water vapour (at 0.1 MPa), the other products being as for the gross calorific value, all at the reference temperature. The NCV ...

#### Bomb calorimeter is used to determine the (where, GCV ...

Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.) a) GCV at constant pressure b) GCV at constant volume c) NCV at constant pressure d) NCV at constant volume

#### What is the exact difference between GCV & NCV? - Quora

The calorific value of a fuel is the quantity of heat produced by its combustion, at constant pressure and under the conditions known as " normal " of temperature and pressure (i.e. to 0°C and under a pressure …

#### Coal Calculations | Energy | SGS

Net Calorific Value (NCV) Calculations and Conversion Factors Ref: Net Calorific Value (ASTM D5865-12) The heat produced by combustion of a substance at a constant pressure of 0.1 Mpa (1 Atm), with any water formed remaining as vapour.

#### Why do gases have two specific heats of Cp and Cv while ...

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.

#### Fuel Calorific value - The Car Tech

The calorific value of a fuel. The calorific value of a fuel is the quantity of heat produced by its combustion - at constant pressure and under "normal" conditions (i.e. to 0 o C and under a pressure …