Units Flashcards
What are the two different types of units?
Fundamental
Derived
What is a fundamental measurement?
2
Fundamental units consist of one expression
They are independent of each other
What is a derived measurement?
Two or more expressions e.g. volume (l x w x h)
What is the SI unit for length?
The meter (m)
What is the SI unit for mass?
The kilogram (kg)
What is the SI unit for time?
The second (s)
What is the SI unit for temperature?
The Kelvin (K)
What is the SI unit for amount of substance?
The Mole (mol)
What is the SI unit for current?
The Ampere (A)
What is the SI unit for light intensity?
Candela (cd)
What is the numerical value of deci?
0.1 or 10^-1
What is the numerical value of centi?
0.01 or 10^-2
What is the numerical value of milli?
0.001 or 10^-3
What is the numerical value of micro?
0.0000001 or 10^-6
What is the numerical value of nano?
0.0000000001 or 10^-9
What is the numerical value of kilo?
1,000 or 10^3
List the most frequently used prefixes in descending order.
Kilo Deci Centi Milli Micro Nano
What is the symbol for nano?
n
What is the symbol for micro?
u (mu)
What is the symbol for milli?
m
How do you set up a conversion factor?
Put the unit that you want on tip and what you’ve got on the bottom
What is mass?
3
The amount of matter in an object
Measured using a balance
Independent of the location of the object
What is weight?
3
Weight is a measure of the effect of gravity on the object
Measured using a scale which measures force against a spring
Depends on the location of the object
What is the formula for density?
Density = mass/volume
