X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [207.189.223.49] (HELO email3.peakpeak.com) by logan.com (CommuniGate Pro SMTP 5.0c6) with ESMTPS id 780925 for flyrotary@lancaironline.net; Sun, 23 Oct 2005 15:27:45 -0400 Received-SPF: none receiver=logan.com; client-ip=207.189.223.49; envelope-from=billdube@killacycle.com Received: (qmail 28423 invoked by uid 513); 23 Oct 2005 19:26:19 -0000 Received: from 207.189.221.63 by email3 (envelope-from , uid 504) with qmail-scanner-1.23 ( Clear:RC:1(207.189.221.63):. Processed in 0.545469 secs); 23 Oct 2005 19:26:19 -0000 Received: from 63-221-189-207.dyn.peakpeak.com (HELO tigger.killacycle.com) ([207.189.221.63]) (envelope-sender ) by email3.peakpeak.com (qmail-ldap-1.03) with SMTP for ; 23 Oct 2005 19:26:18 -0000 Message-Id: <4.3.1.0.20051022183334.01c8d700@mail.chisp.net> X-Sender: billdube@mail.chisp.net X-Mailer: QUALCOMM Windows Eudora Version 4.3.1 Date: Sat, 22 Oct 2005 18:35:36 -0600 To: "Rotary motors in aircraft" From: "BillDube@killacycle.com" Subject: Re: [FlyRotary] Re: specific heat of air In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1"; format=flowed Content-Transfer-Encoding: quoted-printable At 08:39 PM 10/21/2005, you wrote: > Specific Heat (Cp) Density Specific Gravity Specific Heat (Cp) Temp.= =20 > Pressure Temp. Pressure Density > Substance Chemical > Symbol Mol. > Weight =B0 F BTU/lb Air =3D 1 BTU/lb =B0F lb/cu. ft Water =3D 1= BTU/lb =B0F=20 > =B0F psia =B0F psia lb/cu ft > Air -- 28.98 -317.8 88.2 1 0.241 0.08018 from NIST RefProps program, I get: Cp =3D 0.24064 BTU/lbm-F (constant pressure) Cv=3D0.17170 BTU/lbm-F (constant volume) Density =3D 0.072183 lbm/cuft Multiply to get the units you are after. The specific heat is, by devinition, per unit mass, not per unit volume. Bill Dube'