Flashcards in Test 3 Deck (26):
1
A_is the act of comparing and unknown quantity to a standard unit. Consists of a_and a_
Measurement, number, unit
2
An_is any artificial device made for the purpose of refining, extending, or substituting for the human senses when measuring
Instrument
3
A__system is any measuring system in which different sized units are related to each other by multiples of 10
Metric
4
Area
Square meter
m^2
5
Volume
Cubic meter
m^3
6
Mass density
Kilogram per cubic meter
kg/m^3
7
Metric ton
Mass
t
8
Atomic mass unit
Mass
u
9
A__is a fraction that contains both the original unit and it's equivalent value in a new unit and is_to_
Conversion factor, equal, 1
10
What is the basic rule for using conversion factors
In a conversion factor ratio, the new unit is in the numerator and the old unit is in the denominator
11
A quantitive term that describes how close a measurement is to the actual or accepted value of the dimension being measured
Accuracy
12
What is the formula for percent error
(oA/A)•100%
O= observed value
A= accepted value
13
If the percent error is_, then the measurement is considered to be accurate
Small
14
A quantitive evaluation of the exactness of a measurement or a measuring instrument
Precision
15
While accuracy indicates how__a measurement is to the actual value, precision indicates how__and measurement is or how_one can make a measurement
Close, repeatable, exactly
16
What three purposes do significant digits serve
1 they determine the important digits you need to record when making a measurement
2 they indicate the precision of your measurement
3 it helps scientists to report measurements honestly
17
The__of a measurement consists of all the certain digits +1 estimated digit
Significant digits
18
When using significant digits the estimated digit is given in?
Tenths of the smallest subdivision on the instruments scale
19
Rules for adding and subtracting measure data
1 Measure data must be the same kind of dimension and have the same units before they can be added or subtracted
2 The sum or difference of measured data cannot have greater precision than the least precise quantity in the sum or difference
3The product or quotient of measured data cannot have more significant digits in the quantity with the fewest significant digits
4 The product or quotient of a measurement and a counted number, conversion factor, or defined value has the same number of decimal places, or same precision, I see original measurement
5 in compound calculations, do not round off at the intermediate steps
20
**** five steps in problemsolving****
1 read the problem
2 determine the method of solution
3 choose the specific tools to use
4 set up the problem, estimate, and calculate
5 check and format
21
+

Least precise
22
•
/
Least significant figure
23
•
/
With counted number
Go to the decimal place
24
Density equals
D=m/v
25
Volume equals
v=m/D
26