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British System

It is the system of units primarily used by the United States. It is not the system of units used in science

Metric system -

A standardized system of units based on 10

precision

closeness to a set of measurements of the same quantity madeht same way

significant figures

All the digits that can be known precisely in a measurement, plus a last estimated digit

Si

An element in the 3rd period considered a metalloid

kg

kilogram

s

What symbol is used to denote the total distance travelled around a circle?

Cd

Cadmium

mol

what si the unit for Amount of a Substance

Density

amount of mass per units volume

Volume

A measure of space (lwh)

least Sig Fig number

Number of Sig Figs during Multiplication and Division

fewest decimal places of figure

Number of Sig Figs during addition and Subtraction

count

Non-Zero Intagers, ex. 1473.

never count

Leading zeros, ex. 0.00024

650g

6.5*10^3

45km

4.5*10^1

251000dL

2.51*10^5

0.0467kL

4.67*10^-2

0.000000002*10^2mm^3

2*10^-7 mm^-3

4820000 kL

4.82*10^6 kL

0.00234 mg

2.34*10^-3 mg

7.02 cm

7.02*10^1 cm

0.0301256 L

3.01256*10^-2 L

210.03*10^-10 dg

2.1003*10^-2 dg

5.9*10^-3 cL

0.0059 cL

6.43*10^-6 g

0.00000643 g

2.1*10^-7 m

0.00000021 m

4.2*10^1 dm

42 dm

346.69*10^2 mm^3

34669 mm^3

4.76*10^10 cm^3

47600000000 cm^3

8.7492*10^5 kg

87492 kg

2.9*10^4 mm

29000 mm

2.6*10^-3 cL

0.0026 cL

0.65*10^10-2 dg

0.065 dg

2000g

1

2

Determine the number of Significant figures in the following: 0.00035L

0.502mg

2

5.7800dg

3

120.dm

3

482800m

4

0.00702mm

3

602000ml

3

24dl

2

0.10100cm

2

4568 cL

457 cL

790000

789507 cg

0.00005796kg

0.00005800

123477km

123000km

0.006996cm^3

0.007000cm^3

0.001002m^3

0.001000m^3

0.0548579kL

0.0548600kL

6567.2455km^3

6600.0000km^3

4594221 mm^3

4594200 mm^3

1.66*10^6dg

1658690 dg

7.746765*10^-7mm

0.0000007746765 mm

0.0037557cm

3.76*10^-3cm

0.0496g

4.96*10^-2g

2901450m

2.901*10^6m

900001mg

9.00*10^5mg

unit

a specific category that describes a number

meter

a unit of length for longer things, like a race track

kilogram

a unit of mass used for larger objects, like a pineapple

second

base unit of time in the metric system

coulumb

base unit of charge in the metric system

derived unit

A unit defined by a combination of base units

Newton

Thought of light as a particle. If he was correct, light should travel faster in a denser medium.

Deci-

10^ -1

Hecto-

10 to the second power (100)

Centi-

10^ -2

Kilo-

10^ 3

Milli-

10^ -3

U.S. Customary System of units

uses foot, inch, mile, pound, bushel, peck, etc. Unwieldy and causes unnecessary confusion

scientific notation

_______ is used to represent a very large or very small number as a power of 10

What does a positive exponent indicate?

true location of decimal point is to the right of where it is written.

What does a negative exponent indicate?

true location of decimal point is to the left of where it is written

How to read 17.041,301

seventeen and forty-one thousand, three hundred one millionths

How to read 0.0,412?

four hundred twelve ten thousandths

What must we be careful not to do when using measurements in calculations?

must be careful not to assume that the answer we get is more precise than warranted by the preciseness of the measurements used to make the calculations.

Ex: ±.03cm.

How to state the range of uncertainty of a measure?

When is range of uncertainty not helpful?

when determining the accuracy of a calculation in which more than one measurement is used

assume the last digit of the measurement is a guess

What must we do when we cannot be sure of the instrument used to make a measurement?

true

(ex mg)