Measuring Time and Length
What is Time?
The American Herrtage Dictionary defines time as:
NOUN:
a. A nonspatial continuum in which events occur in apparently irreversible succession from the
past through the present to the future.
b. An interval separating two points on this continuum; a duration: a long time since the last
c. A number, as of years, days, or minutes, representing such an interval: ran the course in a
time just under four minutes.
d. A similar number representing a specific point on this continuum, reckoned in hours and
minutes: checked her watch and recorded the time, 6:17 a.m.
Put in almost normal words this means that time
a. Only goes in one direction. (Time travel is the stuff of Science Fiction only)
b. Is measured by the 'time' between two points in time. (1pm to 3pm is two hours)
c. Is measured in units like seconds, minutes, hours, etc.
d. The measurement is also called time. (the time is 6:17am, his time for the run was 45sec)
e. Time is measured using the term 'time'.
So What?.....
All this really means is that we need to be very careful when we use the word 'time'.
Definition
b is the one we care the most about in this class because we will be
measuring time a great deal.  In class seconds and minutes will be used in labs
because our class isn't even 1 hour long (in time).
Measuring Length
 Length is a measurement of distance or dimension. The two main systems to measure length are the metric and the English system. The metric system is based on 10 as you can see in the table below. The meter is the standard unit and portions of that are in tens. You can see the difference between a centimeter and a millimeter in the picture below. Always read a ruler in a direct line, not at an angle.
 Conversion Chart1 centimeter = 0.3937 inches12 inches = 1 foot1 inch = 2.54 centimeters1 foot = 0.3048 meters3 feet = 1 yard1760 feet = 1 mile5280 feet = 1 mile1 yard = 0.9144 meters1 meter = 3.28083 feet1 kilometer = 3281 feet1 kilometer = 0.6214 miles3 miles = 1 league
 Metric Information
 Prefix
 kilo
 hecto
 deka
 meter
 deci
 centi
 milli
 Abbriviation
 k
 h
 dk
 m
 d
 c
 m
 Example
 kilometer
 hectometer
 dekameter
 meter
 decimeter
 centimeter
 millimeter
 Multiplier
 1,000
 100
 10
 1
 0.1
 0.01
 0.001
 In this class we will not be doing much conversion.  Mostly because we will be using all metrics in our measurements.You can use the chart to the side to get an idea of how big each measurement is compared to what you are use to.
 measurement website where you can practice using a centimeter ruler.Measuring fish.
 is Far?