- (Pg)a metric unit of mass equal to 1015 grams or 1 gigatonne (one billion metric tons). This unit is used in atmospheric science and other scientific contexts where large masses are considered.
Dictionary of units of measurement. 2015.
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petagram — noun A unit of mass equal to 1,000,000,000,000,000 grams. Symbol: Pg … Wiktionary
Orders of magnitude (mass) — Iron weights up to 50 kilograms depicted in Dictionnaire encyclopédique de l épicerie et des industries annexes. To help compare different orders of magnitude, the following list describes various mass levels between 10−36 kg and 1060 kg … Wikipedia
Kilogram — Kg redirects here. For other uses, see Kg (disambiguation). Kilogram A computer generated image of the international prototype kilogram (IPK). The IPK is the kilogram. The IPK, which is roughly the size of a golf ball, sits here alongside a ruler … Wikipedia
Tonne — This article is about the metric unit of mass. For other ton units, see Ton. For other uses, see Tonne (disambiguation). The tonne (unit symbol t) or metric ton (US), often written pleonastically as metric tonne, is a unit of mass equal to… … Wikipedia
Peat — is an accumulation of partially decayed vegetation matter. Peat forms in wetlands or peatlands , variously called bogs , moors , muskegs , pocosins , mires , and peat swamp forests . By volume there is about 4 trillion m³ of peat in the world… … Wikipedia
PG — may refer to: Parental Guidance, a rating in various motion picture rating systems MPAA Rated PG Page (paper) Bangkok Airways IATA airline designator Patrologia Graeca, a collection of writings by the Christian Church Fathers Peptidoglycan… … Wikipedia
List of Solar System objects by mass — This is a list of Solar System objects by mass, in decreasing order. This list is incomplete because the masses of many minor planets are not accurately known. The ordering is similar to the order of a list of Solar System objects by radius. Some … Wikipedia
Orders of magnitude (density) — Skylab measured several orders of magnitude of the Sun s density (top scale: 10−18 to 10−6 g⋅cm−3, equivalent to 10−15 to 10−3 kg⋅m−3) at different temperatures and heights above its surface. List of orders of magnitude for density less than … Wikipedia
TNT equivalent — Kiloton redirects here. For the similarly named weight measurements, see Tonne. For the similarly spelled Transformers character, see Megatron. For UK kids gaming magazine, see Megaton (Magazine). Diagram of explosive yield vs mushroom cloud… … Wikipedia
atmosphere, evolution of — Introduction the development of Earth s (Earth) atmosphere across geologic time. The process by which the current atmosphere arose from earlier conditions is complex; however, evidence related to the evolution of Earth s atmosphere, though… … Universalium