Ah - but most lightweight concrete is permeable (due to entraining air bunbbles) and when soaked in water will have a density greater than 1000 kg/m3 and will therefore sink.
However the observant will have noticed that most marinas are now made of floating concrete piers - these actually are blocks of polystyrene with a layer of concrete around them. Just a few more bits of useless information for Friday... Stephen -----Original Message----- From: Dieter K�hler [mailto:[EMAIL PROTECTED] Sent: Friday, 6 August 2004 11:52 a.m. To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Another Welcome back problem > > It goes down, because the block displaced more water when in the > boat, > than it does when in the water. > >Yeah, I'd agree with Phil based on the fact that the block is probably >more dense than the water (it sinks afterall). I guess if we knew the >volume of the concrete block and dimensions of the pool we calculate how >much the water level would drop. Yep. See "http://hypertextbook.com/facts/1999/KatrinaJones.shtml"; for the density of concrete. There seem to exist types of concrete which are lighter than water. Dieter Koehler _______________________________________________ Delphi mailing list [EMAIL PROTECTED] http://ns3.123.co.nz/mailman/listinfo/delphi Disclaimer : This communication contains information that is confidential and the copyright of ensynergy Limited or a third party. If you are not the intended recipient of this communication please delete and destroy all copies and telephone ensynergy Limited on +64 9 3551591 immediately. If you are the intended recipient of this communication you should not copy, disclose or distribute this communication without the authority of ensynergy Limited. Any views expressed in this communication are those of the individual sender, except where the sender specifically states them to be the views of ensynergy Limited. Except as required by law, ensynergy Limited does not represent, warrant and/or guarantee that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. _______________________________________________ Delphi mailing list [EMAIL PROTECTED] http://ns3.123.co.nz/mailman/listinfo/delphi
