METRIC SYSTEM. WHAT is the METRIC SYSTEM? Called the INTERNATIONAL SYSTEM OF UNITS. Used in every...
-
Upload
rodger-dalton -
Category
Documents
-
view
219 -
download
1
Transcript of METRIC SYSTEM. WHAT is the METRIC SYSTEM? Called the INTERNATIONAL SYSTEM OF UNITS. Used in every...
WHAT is the METRIC SYSTEM?
• Called the INTERNATIONAL SYSTEM OF UNITS.
• Used in every country but the United States, Liberia and Burma
• Other countries’ companies are refusing to buy products from the U.S. if not labeled in metric units
• Scientists need a universal way to communicate data (SI Units) with others from different parts of the world.
WHY SHOULD THE UNITED STATES USE THE METRIC
SYSTEM?
What are the “BASIC UNITS” within the METRIC SYSTEM?
•METERS – Length or Distance
•GRAMS – Mass or Weight •LITERS – Volumes of Liquid, Solids or Gases
•10 milligrams equals 1 centigram•10 centigrams equals 1 decigram•10 decigrams equals 1 gram•10 grams equals 1 decagram•10 decagrams equals 1 hectogram•10 hectogram equals 1 kilogram
EXAMPLE: MASS AND WEIGHTS
What is the difference between a yard stick and a meter stick? They both look
the same.
The METER STICK has more numbers so therefore more accurate than a yard stick
•10 METERS equals 1 DEKA-METER
•10 DEKA-METERS equals 1 HECTO-METER
•10 HECTO-METERS equals 1 KILO-METER
What is the numeric difference between the units of measures?
• One millimeter is .001 because there are 1000 millimeters in a meter.
• One centimeter is .01because there are 100 centimeters' in a meter.
• One meter is 1.0 because there is 1 meter to a meter
• One kilometer is 1000.0 because there are 1000 meters in a kilometer.
How do I use a METER STICK?
1.Determine which unit of measure you will be using.
2.Place the 0 end of meter stick at the edge of the object you wish to measure, making sure that the object is at the beginning of the measurements on the meter stick. Disregard any spaces to the left of any 0.
3.Make a note of where the measurement stops. For example: If the measurement ends on a millimeter tick mark, count the total meters, then the centimeters‘ past the meter marks then any millimeters past the centimeter mark.
4.Make sure the decimal places are in their right spot.
•10 milligrams equals 1 centigram•10 centigrams equals 1 decigram•10 decigrams equals 1 gram•10 grams equals 1 decagram•10 decagrams equals 1 hectogram•10 hectogram equals 1 kilogram
MASS AND WEIGHTS
HOW DO YOU USE A TRIPLE BEAM BALANCE?
With the pan empty, move the three sliders on the three beams to their leftmost positions, so that the balance reads zero. If the indicator on the far right is not aligned with the fixed mark, then calibrate the balance by turning the set screw on the left under the pan.
calibrate
Move the 100 gram slider along the beam to the right until the indicator drops below the
fixed mark. The notched position immediately to the left of this point indicates
the number of hundreds of grams.
100 gram slider
(middle)
Now move the 10 gram slider along the beam to the right until the indicator drops
below the fixed mark. The notched position immediately to the left of this point indicates
the number of tens of grams.
10 gram slider
(back)
The beam in front is not notched; the slider can move anywhere along the beam. The boldface numbers on this beam are grams and the tick marks between the boldface
numbers indicate tenths of grams.
10th of GRAMS Slider
(front)
•10 milliliters equals 1 centiliter•10 centiliters equals 1 deciliter•10 deciliters equals 1 liter•10 liters equals 1 decaliter•10 decaliters equals 1 hectoliter•10 hectogram equals 1 kiloliter
MASS AND WEIGHTS
PARTS OF A GRADUATED CYLINDER
Bumper - Keeps the cylinder from breaking if it’s knocked over.
STAND
TUBE – May be glass or plastic
BEAK – Makes it easy to pour liquids
How do you read a GRADUATED CYLINDER?
•Measuring with a graduated cylinder is complicated somewhat by a meniscus.
A meniscus is the curvature of the
surface of the water. Water "sticks" to the
walls of the graduated cylinder, but only on the sides and not the
middle.
• Because of the meniscus, when you look at the surface, the water level is not straight
• Measurement should be at the lowest point of the meniscus.
• You need to read the meniscus at eye level in order to get an accurate reading.
• You should place the graduated cylinder on the table and then lower your head to be able to read the meniscus at eye level.
1. Fill the graduated cylinder to 50 ml. Make a note of this measurement.
2. You may have to fill the graduated cylinder to a higher level to completely submerge an object. In this case your beginning volume will change to the level you started with.
3. Slide the object down the side of the cylinder until it is completely submerged in water.
4. Make a note of this measurement.
5. Subtract the starting measurement from the ending measurement and you’ll have the volume of the irregular shaped solid.
How do I find the VOLUME of an regular shaped
object?
Use the mathematical formula:
length X width X height = V³
length
width
height