2. A group regarded as a distinct entity within a larger group.
3. A mechanical part or module, or an entire apparatus or the equipment that performs a specific function.
4. One of a number of things, organizations, etc., identical or equivalent in function or form.
5. Any specified amount of a quantity, as with reference to length, volume, force, momentum, or time, by comparison with which any other quantity of the same kind is measured or estimated.
6. In medicine, the quantity of a vaccine, serum, drug, or other agent necessary to produce a specific effect.
7. A fixed amount of scholastic study used as a basis for calculating academic credits, usually measured in hours of classroom instruction or laboratory work.
8. A section of an academic course focusing on a selected theme; such as, a unit on U.S History.
9. The number immediately to the left of the decimal point in the Arabic numeral system.
10. In mathematics, the lowest positive whole number; one.
11. Etymology: from 1570, "a single number regarded as an undivided whole", alteration of unity on the basis of a digit. Meaning "single thing regarded as a member of a group" is attested from 1642.
2. A part of a hospital where a particular type of care is provided: "My father was put into the intensive care unit after having that bad accident."
3. A particular amount of length, time, money, etc., which is used as a standard for counting or measuring: "The Euro is the principal unit of Euopean currency."
2. To cause (two or more people or things) to be joined together and become one thing: "The couple wanted to unite in marriage last spring but couldn't because of the terrible car accident."
The cleaning staff that worked in the emergency unit of the hospital decided to unite and ask for better wages.
2. A unit of length used by astronomers to measure distances in space.
One astronomical unit, or AU, is equal to the average distance between the earth and the sun, which is 92,955,806 miles or 149,597,870 kilometers.
2. The quantity of heat equal to 1/180 of the heat required to raise the temperature of one pound of water from 32 degrees to 212 degrees Fahrenheit at a constant pressure of one atmosphere, equal to approximately 1055.056 joules.
A joule is the International System unit of energy or work, equal to the work done when the application point of one newton force moves one meter in the direction of application. Symbol J [Named for the British physicist James Prescott Joule, 1818-1889, noted for his research on the mechanical equivalent of heat].
The main objectives of such crisis assistance procedures are to help people cope with their current problems and to offer guidance and support for long-term therapies.
Three different systems of electric units are used:
- The electromagnetic unit.
- The electrostatic unit.
- The ordinary or practical units.
The commonly used practical units are the ampere or unit of current, the volt or unit of electromotive force, the ohm or unit of resistance, the coulomb or unit of quantity, the farad or unit of capacitance, and the watt or unit of power.
2. Any unit in the centimeter-gram-second system of units for measuring electricity and magnetism that gives a value of one to the magnetic constant; for example, the abampere, abfarad, abhenry, or the abvolt.
2. A microprocessor and memory with electronic maps, forming the central part of an engine management system or of subsystems; such as, a fuel injection or ignition system.
The gas flashes brilliantly when a capacitor is discharged through the tube.
2. A unit based primarily upon the force exerted between two electric charges.
3. An electric unit based primarily on the dynamic interaction of electric charges.
It is defined as a charge which, if concentrated on a small sphere, would repel with a force of one dyne which is a similar charge of one centimeter away in a vacuum.
Rock-stratigraphic units include groups, formations, members, and beds.
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A unit that measures the wavelength of light and equals 0.00000001 of a centimeter. Blue light has a wavelength of about 4400 angstroms, yellow light 5500 angstroms, and red light 6500 angstroms.
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.
Burning one cubic foot of natural gas releases about 1,000 Btu of heat.
The number of particles greater ghan 0.5 micrometers in diameter per cubic foot of air.
Normally, the measure is the weight of contaminants per cubic meter of air.
The International System is called the SI, using the first two initials of its French name Système International d'Unités.
The primary agreement is the "Treaty of the Meter" or the Convention du Mètre, signed in Paris on May 20, 1875.
Forty-eight nations have signed the treaty, including all the major industrialized countries. The United States is a charter member of the metric club, having signed the original document back in 1875.
Each SI unit is represented by a symbol, not an abbreviation. The use of unit symbols is regulated by precise rules.
These symbols are the same in every language of the world; however, the names of the units themselves vary in spelling according to national procedures; therefore, it is correct for Americans to write meter and Germans to write Meter, and it is also correct for the British to write metre, Italians to write metro, and Poles to write metr.
There is no official spelling of the SI units; however, the SI does provide the names, the definitions, and the symbols of the units which must be followed even when the spellings are different as shown below.
The fundamental SI unit of length has numerous spellings
- meter (American English, Danish, Dutch, German, Hungarian, Norwegian, Slovak, and Swedish)
- metr (Czech, Polish, Russian, Ukrainian)
- metras (Lithuanian)
- metre (British, Australian, Canadian and New Zealand English; French)
- metri (Finnish)
- metro (Basque, Italian, Portuguese, Spanish)
A list of elements associated with the International System of Units (SI)
- ampere (unit of measurement)
- are (unit of area measurement)
- atomic second
- candela (cd) (SI unit of measurement)
- centimeter (cm) (unit of measurement)
- coulomb (unit of energy measurement)
- farad (unit of measurement)
- gram (gm or g) (measurement)
- hectare (unit of measurement)
- henry (unit of energy measurement)
- hertz (unit of measurement)
- joule (unit of energy measurement)
- kelvin (K) (unit of measurement)
- kilogram (kg) (unit of measurement)
- kilometer (km) (unit of measurement)
- liter (l) (unit of measurement)
- lumen (unit of energy measurement)
- lux (unit of energy measurement)
- megohm (electronics)
- meter (m) (measurement)
- metric ton (unit of weight)
- micrometer (unit of measurement)
- millimeter (mm) (unit of measurement)
- mole (chemistry)
- nanometer (unit of measurement)
- nanotesla (physics)
- newton (unit of measurement)
- ohm (unit of energy measurement)
- pascal (Pa ) (unit of energy measurement)
- second (unit of time)
- siemens (S) (unit of energy measurement)
- tesla (unit of energy measurement)
- unit (measurement)
- volt (unit of measurement)
- watt (unit of measurement)
- weber (unit of measurement)