Orders of magnitude (density)

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List of orders of magnitude for density less than 1kgm-3
Factor Multiple Value Item
10-27 1 yoctogram (yg)/m³ 1 × 10-27 kg/m³ very approximate density of the universe
10-24 1 zeptogram (zg)/m³
10-22 100 zg/m³ 1 × 10-22 kg/m³ probable lowest observed density of space in galactic spiral arm (1 hydrogen atom every 16 cubic centimetres)
10-21 1 attogram (ag)/m³
10-20
10-19
10-18 1 femtogram (fg)/m³ 1 × 10-18 kg/m³ observed density of space in core of galaxy (600 hydrogen atoms in every cubic centimetre)
10-17 10 fg/m³ 1 × 10-17 kg/m³ best vacuum from a laboratory (1.3 nPa)
10-16
10-15 1 picogram (pg)/m³
10-14
10-13
10-12 1 nanogram (ng)/m³
10-11
10-10
10-9 1 microgram (μg)/m³
10-8
10-7
10-6 1 milligram (mg)/m³
10-5 1.34 × 10-5 kg/m³ Earth atmosphere at 82 kilometre altitude
10-4 1.09 × 10-4 kg/m³ Earth atmosphere at 68 kilometre altitude
10-3 1 gram (g)/m³ 1 gram (g)/m³ vacuum from a mechanical vacuum pump
10-2 10 gram (g)/m³ 1.35 × 10-2 kg/m³ Earth atmosphere at 32 kilometre altitude
90 g/m³ hydrogen gas, the least dense substance at STP
10-1 1.66 × 10-2 Earth atmosphere at 16 kilometre altitude


List of orders of magnitude for density 1kgm-3 and greater
Factor Multiple Value Item
100 1 kilogram (kg)/m³ 1.48 kg/m³ Earth atmosphere at sea level
3 kg/m³ typical density of aerogel
101
102 945 kg/m³ average human body after inhalation
985 kg/m³ average human body
103 1 megagram (Mg)/m³
1 tonne (t)/m³		 1000 kg/m³ liquid water at 4°C
1025 kg/m³ average human body after exhalation
104 10000 kg/m³ 10490 kg/m³ silver
11340 kg/m³ lead
22650 kg/m³ iridium, the densest known substance at STP
105 150,000 kg/m³ core of the Sun
106 1 gigagram (Gg)/m³
107
108
109 1 teragram (Tg)/m³ white dwarf
1010
1011
1012 1 petagram (Pg)/m³
1013 1 × 1013 kg/m³ 2 × 1013 kg/m³ Universe at end of electroweak epoch (approximately)
1014
1015 1 exagram (Eg)/m³
1016
1017 2 × 1017 kg/m³ atomic nuclei and neutron stars
1018 1 zettagram (Zm)/m³
1019
1020
1021 1 yottagram (Yg)/m³
…
1096 5.1 × 1096 kg/m³ Planck density

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