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## PowerPoint Slideshow about ' Metric System' - connley-bogue

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### Metric System

Measurement and SI

Bell Work 8/16/10

Please answer the following questions in the Bell Work section of your science journal

- 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.) Solid Volume can also be measured by water displacement using a graduated cylinder

- 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

- 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 8/20/09

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

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 8/24/09

- What is mass?
- What instrument is used to find mass?
- What is density?
- What is the formula used for density?

Bell Work 8/25/09

- What units are most often used for mass?
- What units are used for density?

Temperature

- Measured in degrees Celsius
- Freezing = 0 degrees Celsius
- Boiling = 100 degrees Celsius

Bell Work 8/26/09

- 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 8/27/09

- How many centimeters are in 1 meter?
- How many milliliters are in 1 liter?
- How many centigrams are in 1 gram?

Weight

- Weight is the measure of attraction between objects due to gravity.
- Basic unit of weight is the Newton (N)

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 8/28/09

- 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 9/1/09

- 98 Hg = ______ mg
- 222 KL = ______ L
- 2706 mm = ______ Dkm
- 5 g = ______ kg

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