Billion

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Billion

1. One thousand million in the short scale numbering system.

2. One million million in the long scale number system. This number is known, perhaps more commonly, as one trillion.

References in periodicals archive ?

We need to repeat this iterative scale-down process of dividing the current length into 10 equal parts two more times to get to the billionth part of our initial 100-metre unit.

How small is a billionth? John Gough presents some practical approaches for conceptualising very small numbers

Put another way, they timed events lasting no longer than ten million billionths of a second.

Experiment over in a flash

"Nano" is the term used to designate a billionth of something -- in this case, a billionth of a meter.

Managing Digital Information: The Emerging Technologies

Unfortunately, thermometers that can measure temperatures of a few billionths of a degree rely on physics that doesn't apply at these extremely low temperatures.

Super cool atom thermometer developed by physicists

At 7 zeptograms, or billionths of a trillionth of a gram, this mass is comparable to that of many small proteins important in functions such as cell-to-cell signaling, Roukes notes.

Lone protein molecule could tip this scale

Most of the studies focused on the effects of lung exposures because the particles' size--just a few billionths of a meter in diameter--permits them to reach the most vulnerable lung tissue.

Nano hazards: exposure to minute particles harms lungs, circulatory system

Nanotechnology is the study and manipulation of materials on atomic and molecular scales measured in billionths of a meter.