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46 Cards in this Set
 Front
 Back
unit

fixed standard of measurement


precision

closeness of set of values obtained from identical measurements of a quantity


accuracy

closeness of a single measurement to its true value


significant figures

those digits in a measured number that include all certain digits plus one final one having some uncertainty


number of sig figs

number of digits reported for the value of a measured or calculated quantity; indicating precision of the value


4 rules of sig fig

1. zeros at beg (left of decimal) aren't sig
2. Terminal zeros (right of decimal) are dig 3. Terminal zeros (left of decimal might be sig 

Scientific Notation

Representation of number in form A x 10^n


2 rules of sig fig calculation

1. Multiply and divide  answer will have least number of sig figs
2. add subtract  answer will have least number of decimal places 

exact number

number that arises when you count items or when you define a unit


rounding

procedure of dropping nonsig digits in a calculation and adjusting the last digit reported


Rounding rules

1. If digit is 5 or greater drop it and all other to right and add 1 to last digit
2. If digit is less than 5 drop it all digits past it 

SI Base Units
length 
meter m


mass

kilogram kg


time

second s


temperature

kelvin K


amount of substance

mole mol


electric current

ampere A


Luminous intensity

candela cd


10^18

exa
E 

10^15

peta
P 

10^12

tera
T 

10^9

giga
G 

10^6

mega
M 

10^3

kilo
k 

10^2

hecto
h 

10

deka
da 

10^1

deci
d 

10^2

centi
c 

10^3

milli
m 

10^6

micro
u mu 

10^9

nano
n 

10^12

pico
p 

10^15

femto
f 

10^18

atto
a 

Formula to convert K and degrees C

Kelvin equals celcius times 1K over IC and then add 273.15K


Formula to convert C to F

celcius equals 5 deg C over 9 deg F times the result of temp in F minus 32 deg F


SI derived unit

unit dervived by combining base units


area

length squared
m^2 

volume

length cubed
m^3 

density

mass per unit volume
kg/m^3 

speed

distance traveled per unit of time
m/s 

acceleration

speed changed per unit of time
m/s^2 

force

mass times acceleration of object
kg x m/s^2 (=newton, N) 

pressure

force per unit area
kg/(m * s^2) (=pascal, Pa) 

Energy

force times distance traveled
kg * m^2/s^2 (=joule, J) 

density

d=m/V
