# Extra Material: The Equations Behind the Words

• Itzhak Bars
• John Terning
Chapter
Part of the Multiversal Journeys book series (MVJ)

## Abstract

It is usually more convenient to use metric units (technically the International System of Units or SI). A brief list of some of the more useful units is given in Table 13.1. A meter is about a yard long and a raisin weighs about a gram. Water boils at 373 K, room temperature is about 293 K, water freezes at 273 K, and the remnants of the Big Bang explosion are now at about 3 K. Nothing can be colder than absolute zero, which is 0 K. One of the advantages of using SI is that when going from large to small (or vice versa) it is easier to change to a more convenient unit, since larger units are just multiples of 10 times the basic unit, see Table 13.2. For example 1 km is 1000 m and 1 m is 100 cm, so a kilometer is 100,000 cm and a kilogram is 100,000 cg. Now, quickly, a mile is how many inches?

## Keywords

Black Hole Gauge Theory Large Hadron Collider Gravitational Field Standing Wave
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.