From phma@oltronics.net Mon Jul 31 08:16:51 2000 Return-Path: Received: (qmail 11066 invoked from network); 31 Jul 2000 15:16:51 -0000 Received: from unknown (10.1.10.142) by m2.onelist.org with QMQP; 31 Jul 2000 15:16:51 -0000 Received: from unknown (HELO mail.oltronics.net) (204.213.85.8) by mta1 with SMTP; 31 Jul 2000 15:16:50 -0000 Received: from neofelis (root@localhost) by mail.oltronics.net (8.9.3/8.9.3) with SMTP id IAA10678 for ; Mon, 31 Jul 2000 08:13:18 -0400 X-BlackMail: 207.15.133.36, neofelis, , 207.15.133.36 X-Authenticated-Timestamp: 08:14:39(EDT) on July 31, 2000 To: lojban@egroups.com Subject: Re: [lojban] force and pressure Date: Mon, 31 Jul 2000 08:05:49 -0400 X-Mailer: KMail [version 1.0.28] Content-Type: text/plain References: In-Reply-To: MIME-Version: 1.0 Message-Id: <00073108131700.00899@neofelis> Content-Transfer-Encoding: 8bit From: Pierre Abbat >There are worse cases than this. The output rate of a lumber factory can >naturally be measured in m sec^-1, but that is not a velocity! >Similarly, fuel consumption (of a vehicle) is measured in l km^-1, but >is not an area, even though "liter" has dimensions proportional to m^3. >Paint coverage is measured in l m^-2, which is not a length. Agreed except the last. The liter per square meter is a millimeter; it's not exactly a length, but rather a thickness. Another example is resistivity. This is expressed in ohm-centimeters, though it's really ohm*cm^2/cm, and it doesn't make much sense to multiply an ohm by a centimeter. phma