Trillions (short Scale) to Pairs (T to pr)

1 trillion (short scale) equals 500,000,000,000 pairs exactly.

1 trillion (short scale) = 500,000,000,000 pairs

How to convert trillions (short scale) to pairs

To convert trillions (short scale) to pairs, multiply the number of trillions (short scale) by 500,000,000,000. This factor is exact. To go the other way, multiply pairs by 2×10⁻¹².

pairs = trillions (short scale) × 500,000,000,000

Example: 10 trillions (short scale) = 5,000,000,000,000 pairs.

Large-number names differ around the world: this site uses the short scale (billion = 10⁹) by default, and lists the long-scale billion separately.

About these units

Trillion (short Scale) (T)

General & non-SICurrent unit

One thousand billion (10¹²) in the short scale used in English.

A trillion is a thousand billion, 10¹², and its name fits the short-scale pattern in which each new name multiplies by a thousand: million, billion, trillion, quadrillion. The prefix tri- is Latin for three, and in Jehan Adam's 1475 scheme trimillion meant the third power of a million, 10¹⁸. That is still the long-scale meaning of trillion, so the short-scale trillion equals the long-scale billion.

The SI prefix for 10¹² is tera-. Where the long scale is used, including continental Europe, French Canada, and the Spanish-speaking Americas, the same word names 10¹⁸. A trillion seconds is about 31,700 years. Trillions turn up in energy statistics: an explainer from the U.S. Energy Information Administration cites U.S. natural gas consumption of 32.51 trillion cubic feet, which it converts to 33.61 quads.

1 trillion (short scale) = 1,000,000,000,000 pieces (exactly).

Sources: Wikipedia: Names of large numbers; U.S. EIA: British thermal units (Btu); BIPM SI Brochure, 9th edition (2019)

Pair (pr)

General & non-SICurrent unit

Two items.

Pair comes from Old French paire, which grew out of Latin paria, the neuter plural of par, meaning equal. German Paar and Dutch paar are relatives of the same word. The core idea is two matching things taken together, as in a pair of shoes or gloves.

English also uses pair for single objects built from two connected parts. Scissors, spectacles, trousers, and jeans are plural-only nouns, so a counting word is needed: you say a pair of scissors or several pairs of jeans. That makes the unit slightly slippery. Six pairs of socks is 12 socks, but six pairs of scissors is only six objects. The word has other senses too, such as two people in a relationship or two cards of equal rank in poker, but as a quantity of loose items it is always two.

1 pair = 2 pieces (exactly).

Sources: Wiktionary: pair

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