Orders of magnitude (density)
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| 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 | 2.0 × 10-14 kg/m³ | density of Sun's corona[1] | |
| 10-13 | 1.0 × 10-13 kg/m³ | density at top of solar transition region[1] | |
| 10-12 | 1 nanogram (ng)/m³ | ||
| 10-11 | 1.0 × 10-11 kg/m³ | density at bottom of solar transition region[1] | |
| 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; star Mu Cephei's approximate mean density |
|
| 10-4 | 0.1 gram (g)/m³ | 1.09 × 10-4 kg/m³ | Earth atmosphere at 68 kilometre altitude; |
| 2.0 × 10-4 kg/m³ | Density of Solar photosphere-chromosphere boundary[1] | ||
| 4.0 × 10-4 kg/m³ | Density of Solar photosphere's lower boundary[1] | ||
| 10-3 | 1 gram (g)/m³ | 1 gram (g)/m³ | vacuum from a mechanical vacuum pump; density of Sun just below its photosphere[1] |
| 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[citation needed] |
| 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 | |||
| 103 | 1 megagram (Mg)/m³ 1 tonne (t)/m³ |
1000 kg/m³ | liquid water at 4°C |
| 1010 kg/m³ | average human body | ||
| 1400 kg/m³ | average density of Sun | ||
| 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 |
