Physical Chemistry Laboratory Fall
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. The potential of the object is the potential between the object and the infinite sphere.
If a capacitor with charge on its plates has a capacitance of, say, 2 microfarad, then its capacitance is also 2 microfarad when the plates have no charge.
|Specific Heat Capacity||The suffixes P and V refer to constant pressure and constant volume conditions respectively.|
A common misunderstanding about electrical capacitance is to assume that capacitance represents the maximum amount of charge a capacitor can store.
It is wrong because the maximum charge one may put on a capacitor plate is determined by the potential at which dielectric breakdown occurs.Biogas. Biogas is formed by the anaerobic decomposition of putrescible organic initiativeblog.com CHP (combined heat and power or cogeneration) is the utilisation of biogas, typically in a biogas engine, for the production of electricity and useful heat, at high efficiency.
Clarke Energy is a distributor of GE Jenbacher biogas engines which are designed for robust operation on difficult gases. Expt. 3: Heat Capacity of Gases CHEM III-1 Heat Capacity Ratios for Gases Introduction Chemistry is the study of matter, of the transformations that occur in matter and of the changes in.
Noble gases i.e. monoatomic gases: Classical Kinetic Theory Survival Heat capacity of an ideal noble gas at constant volume Heat capacity of a noble gas at constant pressure.
The specific heat (= specific heat capacity) at constant pressure and constant volume processes, and the ratio of specific heats and individual gas constants - R - for some commonly used "ideal gases", are in the table below (approximate values at 68 o F (20 o C) and psia (1 atm))..
For conversion of units, use the Specific heat online unit converter. Whereas in recuperators, where heat is transferred directly and immediately through a partition wall of some kind, from a hot to a cold fluid, both of which flow simultaneously through the exchanger, the operation of the regenerative heat exchanger involves the temporary storage of the heat transferred in a packing which possesses the necessary thermal capacity.
Heat capacity or thermal capacity is a measurable physical quantity equal to the ratio of the heat added to (or removed from) an object to the resulting temperature change.
The unit of heat capacity is joule per kelvin, or kilogram metre squared per kelvin second squared ⋅ ⋅ in the International System of Units ().The dimensional form is L 2 M T −2 Θ −1.