# Measurements and Mathematics Terms

#### (mathematics is the deductive study of quantities, magnitudes, and shapes as determined by the use of numbers and symbols while every branch of science and engineering depends on mathematics; measurement is the process of associating numbers with physical quantities and phenomena and measurement is fundamental to the sciences; to engineering, construction, and other technical fields; and to almost all everyday activities)

2. A unit of electrical current or rate of flow of electrons.

One volt across one ohm of resistance causes a current flow of one ampere.

Used to measure battery capacity.

Named for Anders Jonas Ångström (1814-1874), Swedish astrophysicist.

- Twenty grains equal one scruple.
- Three scruples equal one dram.
- Eight drams equal an apothecary's ounce; oz apoth.
- Twelve such ounces equal an apothecary's pound; lb apoth.

There are 7,000 grains in one pound avoirdupois or 0.454 kilograms.

For simplicity, an AU is usually rounded off to 93,000,000 miles or 149,637,000 kilometers.

2. An astronomical unit is used to describe planetary distances.Light travels this distance in approximately 8.3 minutes.

^{5}newtons per square meter (the terms used here are located in this unit).

The actual pressure exerted by he atmosphere fluctuates around this value, which is assumed to be standard at sea level and zero degrees centigrade/32 degrees Fahrenheit, and is used when dealing with very high pressures.

The relative atomic mass of any element, expressed in grams, contains this number of atoms.

It is named for an Italian physicist Amedeo Avogadro (1776-1856).

It includes the pound, short and long tons, ounce, and dram.

2. A system of units of mass based on the pound (0.45 kilograms), which consists of 16 ounces (each of 16 drams) or 7,000 grains (each equal to 65 milligrams).See this **Index** or **Menu** for a variety of other topics.