A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.For example, a length is a physical quantity. The metre is a unit of length that represents a definite predetermined length. When we say 10 metres (or 10 m), we actually mean 10 times the definite predetermined length called "metre".
How many first year engineering students does it take to change a light bulb?
None. That’s a second year subject.
How many second year engineering students does it take to change a light bulb?
One, but the rest of the class copies the report.
How many third year engineering students does it take to change a light bulb?
“Will this question be in the final examination?”
How many civil engineers does it take to change a light bulb?
Two. One to do it and one to steady the chandelier.
How many electrical engineers does it take to change a light bulb?
None. They simply redefine darkness as the industry standard.
How many computer engineers does it take to change a light bulb?
“Why bother? The socket will be obsolete in six months anyway.”
How many mechanical engineers does it take to change a light bulb?
Five. One to decide which way the bulb ought to turn, one to calculate the force required, one to design a tool with which to turn the bulb, one to design a comfortable – but functional – hand grip, and one to use all this equipment.
How many nuclear engineers does it take to change a light bulb?
Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years