2011-02-21 14:03:08 | John McLean Miscalculation | |

Alan aj.flint@bigpond... 121.219.99.104 |
Thought you might be interested in another McLean rant that seems to have its basic physics that he claims to know so much about all wrong. http://www.quadrant.org.au/blogs/doomed-planet/2011/01/alarmists-ignore-physics Here he is claiming 1m of seawater has the same heat capacity of 3300m of atmosphere. A few calculations seem to prove that the heat capacity he claims is out by a factor of 855. But it is a while since I did tertiary physics so I wouldn't mind a cross check. Values for specific heat capacity Cp Air: 1.0035 J/(g*K) fresh Water: 4.1813 J/(g*K) The At 3300m it is about 72% of sea level, basically linear reduction with height. So in the first 3300m density is an average 86% of SL or 1053.5 kg/m3. 1m of Seawater; density is 1025kg/m3, specific heat capacity 3993 J /kg/K @20 degrees. water air SL density/m3 1025 1.22521 density factor 1 .86 av/density kg/m3 1025 1.0535 height 1 3300 actual kg 1025 3663 kj/kg/K 3993 1003.5 kj/K for "x"amount depth (m) Kj/K of this mass Ratio 1.225 0.86 3300 1057 1004 1060887 0.259 of water 1025 1025 1 1025 3993 4092825 3.857926 of air
seawater @20C 1025kg/m3 In other words the first 3300m of atmosphere has a bit more than a quarter of the heat capacity of 1m of water. So McLeans conclusions as to relative heat capacities of atmospheric air to water are out by a factor of 3300/3.857926 or 855. He canâ€™t even claim a decimal point error with any more conviction than the rest of his bodgy unqualified theories. Alan Flint |