Volume and density required for something to exist?
2006-08-21 23:31:25 · 3 answers · asked by goring 6 in Science & Mathematics ➔ Physics
Yes time can be calculated as so look at the website because the equation could not be posted:
Taking the matter energy density to be 0.5 GeV/m3, then the expansion time calculated from that is about 4.5 x 109 years. If the energy density of matter is taken to be the critical density of about 5.5 GeV/m3 associated with a Hubble parameter of 72 km/s/Mpc, then the expansion time at the present temperature of 2.7K is 13.6 x 109 years. The calculation of critical density comes from an expression in Weinburg.
2006-08-21 23:49:37 · answer #1 · answered by radtadstar 2 · 1⤊ 0⤋
Time is nothing but recording change and energy needs volume, not always.
2006-08-22 06:50:05 · answer #2 · answered by babuoe 2 · 0⤊ 0⤋
Time is a concept.
2006-08-22 06:36:28 · answer #3 · answered by John R 4 · 1⤊ 0⤋