As you can see, in order to determine the ultimate fate of the universe, we need to know how the average density of the universe compares to the critical density. This is equivalent to a mass density of 9.9 x 10 -30 g/cm 3 , which is equivalent to only 5.9 protons per cubic meter. The mass density at the current time was assessed by WMAP to be Ω m,0 = 0.27 +/- 0.04. But the assessment of ordinary or baryonic matter was only 0.044 +/- 0.004, so baryonic matter constitutes ony 17% of the matter of the universe, the remainder being classified as "dark matter". Matter Density, Ω m. The Ω m parameter specifies the mean present day fractional energy density of all forms of matter, including baryonic and dark matter. radiation density of the universe, ρm is the matter density of the universe, and ρd is the dark energy density of the universe. The solution to the equation of conservation of energy results in a critical density of about 10 –29 g/cm 3, or about 5 hydrogen atoms per cubic meter. The variable k is the curvature parameter of the universe and can be either -1, 0, or 1 for a closed, flat, and open universe respectively. R0 as stated before is the separation The density of the universe means the amount of matter there is per unit volume, averaged for the entire universe.
One way to find the average density would be to add up all the matter in the universe and then divide by the number of cubic meters in the universe. Average Density of Matter in the Universe. WMAP determined that the universe is flat, from which it follows that the mean energy density in the universe is equal to the critical density (within a 0.5% margin of error). However, this process is difficult to … If the Universe is at the critical density, then the total mass of the Universe is closer to 1e53 kg, and the number of atoms (assuming that most of the mass is in the form of hydrogen atoms) about 6e79.
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