measurement Flashcards
1
Q
who were the first to use measurements
A
Egyptians, with the cubit
2
Q
What measurement system is used all around the world except the US
A
The metric system
3
Q
Why is the metric system used more
A
It's simple Less units to learn Units are in multiples of 10 easy prefixes less chance of error all scientists use it
4
Q
SI prefixes and standard base unit
A
Mega (million, M) kil (thousand, k) hecto (hundred, h) deka (ten, da) deci (one tenth, d) centi (one hundredth, c) milli (one thousandth, m) micro (one millionth, u)
Standard base = meter (m)
5
Q
Length
mass
volume
A
meter
gram
liter
6
Q
Temperature
A
centigrade/celcius/kelvin
boiling point = 0 freezing point= 100
7
Q
Covnerting
A
C to F F to C
multiply by 9 sub 32
divide by 5 multiply by 9
add 32 divide by 5
8
Q
7 SI base units
A
length = meter mass = kilogram temp. = centigrade/Celsius/kelvin time = seconds amount of substance = mole electric current = ampere luminous intensity = candela
9
Q
Precision and accuracy
A
Precision = how close a set of measurements are to each other
Accuracy = how close the a measurement is to the accepted/true value
