Some units are deeply embedded in history and culture, and their use has not been entirely replaced by their SI alternatives. The litre differs from the SI coherent unit m3 by a factor 0.
Standard dictionaries are not always the best source of useful and correct definitions of them. This glossary is not intended to be complete.
It focuses on those terms which give students particular difficulties. Some words have subtle and intricate meanings which cannot be encapsulated in a short definition. This document is continually under development and may never be finished.
Conforming closely to some standard. Having very small error of any kind. The uncertainty in a measured quantity is due to inherent variations in the measurement process itself. The uncertainty in a result is due to the combined and accumulated effects of these measurement uncertainties which were used in the calculation of that result.
When these uncertainties are expressed in the same units as the quantity itself they are called absolute uncertainties. Uncertainty values are usually attached to the quoted value of an experimental measurement or result, one common format being: This technical term is a historic relic of the 17th century, before energy and momentum were understood.
It is ok to say that the number of particles in a gram-mole is 6. This can be confusing and misleading to students who are conscientiously trying to learn how to balance units in equations. A few books prefer a kilogram-mole. The unit name for a gram-mole is simply mol. The unit name for a kilogram-mole is kmol.
Some textbooks still prefer to use use the kilogram-mole, or worse, use it and the gram-mole. This affects their quoted values for the universal gas constant and the Faraday Constant. Though these are used in science, their definitions are independent of science.
No experiment of science can ever determine their value, except approximately. You find it only by counting atoms or molecules in something of known relative molecular mass. While the use of the word because as a link in a chain of logical steps is benign, one should still replace it with words more specifically indicative of the type of link which is meant.
The seeker after truth sought wisdom from a Guru who lived as a hermit on top of a Himalayan mountain. After a long and arduous climb to the mountain-top the seeker was granted an audience. Sitting at the feet of the great Guru, the seeker humbly said: The capacitance of a capacitor is measured by this procedure: Put equal and opposite charges on its plates and then measure the potential between the plates.
Capacitors for use in circuits consist of two conductors plates. Unfortunately this process is usually called charging the capacitor, which is misleading because it suggests adding charge to the capacitor. In fact, this process usually consists of moving charge from one plate to the other.
The capacity of a single object, say an isolated sphere, is determined by considering the other plate to be an infinite sphere surrounding it.Rate. A rate is a ratio that expresses how long it takes to do something, such as traveling a certain distance.
To walk 3 kilometers in one hour is to walk at the rate of 3 km/h. Physics and Astronomy Glossary Technical terms of science have very specific meanings.
Standard dictionaries are not always the best source of useful and correct definitions of them. "The Global Macro Edge is a book that not only redefines what alpha is, but outlines exactly what to pay for it. The Netto Number, Risk Factor Compensation System, and other proposed innovations provide a template for incentive fees that Wall Street and investors can use for years to come.
kcc1 Count to by ones and by tens. kcc2 Count forward beginning from a given number within the known sequence (instead of having to begin at 1).
kcc3 Write numbers from 0 to Represent a number of objects with a written numeral (with 0 representing a count of no objects). kcc4a When counting objects, say the number . The Sharpe ratio is the average return earned in excess of the risk-free rate per unit of volatility or total risk.
Learn all about proportional relationships. How are they connected to ratios and rates? What do their graphs look like? What types of word problems can we solve with proportions?