Metric System

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# Metric System - PowerPoint PPT Presentation

Metric System. Measurement and SI. Bell Work 8/16/10. Please get our your signed syllabus sheet Please get a peach bell work sheet and begin answering the following questions in complete sentences What instrument is used to measure length?

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## PowerPoint Slideshow about 'Metric System' - erin-parsons

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### Metric System

Measurement and SI

Bell Work 8/16/10

Please get a peach bell work sheet and begin answering the following questions in complete sentences

• What instrument is used to measure length?
• Why do you think it is important to know how to measure length?
Metric System
• Referred to as the international system of units or SI
• Based on the number 10
• Measuring system used by all scientists
• Used to measure length, volume, mass, weight, density, and temperature
Length
• Used to measure from one point to another
• Instrument used to measure length is the metric ruler
• Basic unit of length is the meter
• kilometer- km
• hectometer- hm
• decameter- dam
• meter-m
• decimeter- dm
• centimeter- cm
• millimeter – mm
• In space, distance is measured in light years
• A light year is the distance light travels in a year
Bell Work 8/17/10
• What is the metric system used to measure?
• What is the metric system referred to as?
• What is the basic unit for length?
• In space, what is distance measured in?
Homework 8/17/10

Practice measuring the following items at your house. Remember to use centimeters as your unit.

• The width of your front door
• The height of a glass or cup
• One item of your choice
• For each write down the item and the measurement for the item
Bell Work 8/18/10

Using a ruler and centimeters (cm) measure the length of the lines on the piece of paper at your table. Please share with your partner and don’t write on the paper.

Example: 6.3 cm

• Length of line 1:
• Length of line 2:
• Length of line 3:
• Length of line 4:
Volume
• Volume is the amount of space an object takes up
• Volume can be measured for liquids and solids.
• Liquids

Basic unit of liquid volume is the liter (L)

• kiloliter – kL
• hectoliter – hL
• dekaliter – daL
• liter – L
• deciliter – dL
• centiliter – cL
• millimeter – mL
• The instrument used to measure liquid volume is the graduated cylinder
• Meniscus – Measure to this line.
Volume (cont.)
• Solids

Basic unit of solid volume is cubic meters (m^3)

• cubic kilometer- km^3
• cubic hectometer- hm^3
• cubic decameter- dam^3
• cubic meter-m^3
• cubic decimeter- dm^3
• cubic centimeter- cm^3
• cubic millimeter – mm^3
Volume (cont.)
• To calculate the volume of a solid
• length x width x height
• l x w x h
• Instrument used to measure solid volume is the metric ruler
• Solid Volume can also be measured by water displacement using a graduated cylinder
• Record the volume of water in the cylinder
• Place the object in the cylinder and record the new volume
• Measurement 2 – measurement 1 = volume of the object
Bell Work 8/19/10
• What is volume?
• What is the basic unit for liquid volume?
• What is the basic unit for solid volume?
• How do you calculate the volume of a solid?
Bell Work 8/20/10

1. What is the volume of a solid with these measurements?

Length 3 cm width 2 cm height 4 cm

2. How do you find the volume of an irregular solid?

Mass
• Mass is the amount of matter in an object.
• Basic unit of mass is a gram (g)
• Large objects are measured in kilograms (kg)
• Small objects are measured in grams (g) or milligrams (mg)
• kilogram – kg
• hectogram – hg
• dekagram – dag
• gram – g
• decigram – dg
• centigram – cg
• milligram – mg
• Most often used are the kg, g, and the mg
• Instrument used to measure mass is the triple beam balance
Bell Work 8/23/10

• What is mass?
• What instrument is used to measure mass?
Bell Work 8/24/10

• What basic units do we use to measure volume?
• What basic units do we use to measure length?
• What basic units do we use to measure mass?
Density
• Shows a relationship between mass and volume
• To calculate density we divide mass by volume
• d=m/v
• Units for density depend on size of object
• Large objects = kg/L
• Small objects = g/mL
Bell Work 8/25/10

Find the density of an object with

1. m=50g

v=5mL

2. m=200kg

v=2L

Temperature
• Measured in degrees Celsius
• Instrument = Theremometer
• Freezing = 0 degrees Celsius
• Boiling = 100 degrees Celsius
Bell Work 8/26/10

Please DO NOT touch the microscopes!!!

• What instrument is used to measure temperature?
• What is the freezing point in degrees Celsius?
• What is the boiling point in degrees Celsius?
Bell Work 8/27/10

Find the density of the following objects

• m = 20 g v = 4 mL
• m = 60 kg v = 2 L
• m = 8 g v = 8 mL
Weight
• Weight is the measure of attraction between objects due to gravity.
• Basic unit of weight is the Newton (N)
Bell Work 8/30/10

Please get a new pink bell work sheet from the counter by the sinks.

• What is weight?
• What unit is weight measured in?
• How many centimeters are in a meter?
Tools for Measuring
• A metric ruler is used to find length
• A graduated cylinder is used to fine the volume of a liquid or an irregular solid
• A metric ruler is used to find the volume of a rectangular object
• A triple beam balance is used to find the mass of an object
Bell Work 8/31/10
• 1000 g = ______ kg
• 200 mL = ______ L
• 1 m = ______ Dkm
• 77 g = ______ mg
Bell Work 8/28/09
• 25 kg = ______ mg
• 345 cL = ______ HL
• 980 m = ______ mm
• 23700 g = ______ kg
Bell Work 9/1/10
• 98 Hg = ______ mg
• 222 KL = ______ L
• 2706 mm = ______ Dkm
• 5 g = ______ kg
Bell Work 09/09/09

What is the base unit for the following?

• Length
• Volume
• Mass