In astrophysics and quantum physics a jiffy is, as defined by Edward R. Harrison, the time it takes for light to travel one fermi, which is approximately the size of a nucleon. One fermi is 10−15 m, so a jiffy is about 3 × 10−24 seconds.

zeptosecond

supereon

A day is approximately the period during which the Earth completes one rotation around its axis, which takes around 24 hours. The unit of measurement “day” (symbol d) is defined as 86,400 SI seconds. The second is designated the SI base unit of time.

The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.

Bytes

So why is the Planck length thought to be the smallest possible length? The simple summary of Mead’s answer is that it is impossible, using the known laws of quantum mechanics and the known behavior of gravity, to determine a position to a precision smaller than the Planck length.

A nanometer (nm) is 1,000 times smaller than a micrometer. It is equal to 1/1,000,000,000th or one-billionth of a meter. When things are this small, you can’t see them with your eyes, or a light microscope. Atoms are smaller than a nanometer.

The standard measure of length in science is in meters (m). One nanometer (1 nm) is equal to 10-9 m or 0.000000001 m.

nine zeros

Yes, half a yoctometer…..just kidding. Yoctometer is the smallest length unit under the SI international Standard of Units, and represents 1 x 10^-24 meters. The Planck length is smaller at 1.616229(38) x 10^-35 meters and represents the smallest distance of 2 locations.

The hectometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: hm) or hectometer (American spelling) is a unit of length in the metric system, equal to one hundred metres. The word comes from a combination of “metre” and the SI prefix “hecto-“, meaning “hundred”.

Metric Meter

The micrometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equalling 1×10−6 metre (SI standard prefix “micro-” = 10−6); that is, one millionth of a metre (or one …

Just how small is “nano?” In the International System of Units, the prefix “nano” means one-billionth, or 10-9; therefore one nanometer is one-billionth of a meter. There are 25,400,000 nanometers in one inch. A human hair is approximately 80,000- 100,000 nanometers wide.

A centimeter is 100 times smaller than one meter (so 1 meter = 100 centimeters).

1000 micrometers

Units of measurement: cm (centimetre) = 1/100 m mm (millimetre) = 1/1000 m μm (micrometre) = 1/1000 000 m nm (nanometre) = 1/1000 000 000 m Most cells and microorganisms are too small to be seen with the naked eye. The smallest object the human eye can see without magnification is about 0.1 mm (or 100 μm) in diameter.

100 cm

tmm = tenths-of-a-milli-meter.

It is important to note that the kilogram is the only SI unit with a prefix as part of its name and symbol….Table 5. SI prefixes.

One centimeter

one decimeter

Convert meter to cm, centimeters to meter (1m = 100cm)

The base unit of length in the SI system is the meter(m). The meter, approximately 10% longer than a yard, is equivalent to 39.37 inches, or 1.094 yards….

Everyday Examples of Metric