clavius.org "Clavius: Environment – heat" Clavius: Environment - heat clavius.org «Clavius: Environment - heat» clavius.org http://www.clavius.org/envheat.html http://www.clavius.org/envheat.html http://www.clavius.org/envheat.html http://www.clavius.org/envheat.html "Clavius: Environment - heat"