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## PowerPoint Slideshow about ' Measurements & Math' - breanna-kramer

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Exact numbers!

- Numbers determined by counting or by definition
- Ex: 6 apples, 1 teacher
- 1 inch=2.54 cm

In Science…

- Numbers are based on MEASUREMENTS made in the lab.
- Our data is only as good as the measurements we make and the instruments we use.

Qualitative Data

- Observation that DOES NOT involve a number/measurement
- EX. Presence of odor, color change

Quantitative Data

- Observation that DOES involve a number/measurement (has magnitude size or amount)
- Ex. Length, mass, volume

Copy in your notes!!

- Accuracy: how close a measured value is to the actual (true) value.
- Precision: how close the measured values are to each other.

Significant Figures

- Shows how PRECISE a measurement is
- Indicates the QUALITY of the instrument you use (how sensitive or exact)

EX. Graduated cylinder vs. beaker

Scientific Notation

- Used to write really LARGE or really small #’s
- Why? To save space & time

steps of the scientific notation

- Step 1) Determine the sig figs
- 106,000,000 = 3 sig figs
- Step 2) Determine the value of M using the sig figs
- 1.06 (remember this must be between 1 and 10)
- Step 3) Add the 10’s multiplier
- 1.06 x 10n

Step 4) Determine the value of “n” by counting the number of times you move the decimal in the original number to get the value for “M”

- Step 5) Determine the sign of “n” by looking at the direction that you moved the decimal
- Move decimal to left = “n” is positive
- Move decimal to right = “n” is negative

SI Units of Measurement

- One system for all scientists around the world
- We must have a standard for comparison

length – meter (m)

mass – kilogram(kg)

time – second (s)

volume – liter (L)

SI prefixes

- Added to base units to represent large or smaller quantities

SI Prefix Unit Abbreviation Exponential Factor

kilo K 103

hecto h 102

deka da 101

BASE m,g,s,L 100

deci d 10-1

centi c 10-2

milli m 10-3

King Henry Died By Drinking Chocolate Milk

Example

- 14.6 dL= __________ kL

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