Metric System

7th Grade Notes 2011

Bell WorkPlease get our your signed syllabus sheet

Please get out your science journal and begin answering the following questions in complete sentences

1. What instrument is used to measure length?

2. Why do you think it is important to know how to measure length?

Metric System

1. Referred to as the international system of units or SI

2. Based on the number 103. Measuring system used by all

scientists4. Used to measure length, volume,

mass, weight, density, and temperature

Length1. Used to measure from one point to another2. Instrument used to measure length is the

metric ruler3. Basic unit of length is the meter

– kilometer- km– hectometer- hm– decameter- dam– meter-m– decimeter- dm– centimeter- cm– millimeter – mm

4. In space, distance is measured in light years– A light year is the distance light travels in a year

Bell Work 8/17/10

1. What is the metric system used to measure?

2. What is the metric system referred to as?

3. What is the basic unit for length?

4. 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.

1. The width of your front door2. The height of a glass or cup3. One item of your choice

– For each write down the item and the measurement for the item

Bell Work 8/18/10Using 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

1.Volume is the amount of space an object takes up

2.Volume can be measured for liquids and solids.

Volume (cont.)3. Liquids – The basic unit for liquid volume is

the Liter

___________________________L______________________

4. The instrument used to measure liquid volume is the graduated cylinder

5. When measuring liquid volume you measure

to the meniscus

Volume (cont.)6. Solids

Basic unit of solid volume is cubic meters (m3)

– cubic kilometer- km3

– cubic hectometer- hm3

– cubic decameter- dam3

– cubic meter-m3

– cubic decimeter- dm3

– cubic centimeter- cm3

– cubic millimeter – mm37. The instrument used to measure solid volume is a meter stick.

There are 2 Ways to Measure Solid Volume

1. Length x Width x Height

2. Water Displacement using a graduated cylinderSteps

1. Record the volume of the water in the cylinder

2. Place the object in the cylinder and record the new volume

3. Complete the following math problem:

Measurement 2 – measurement 1 = volume of the object

Bell Work 8/19/10

1. What is volume?2. What is the basic unit for liquid

volume?3. What is the basic unit for solid

volume?4. 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?

Mass1. Mass is the amount of matter in an object.

2. The basic unit for mass is a gram

___________________________g_______________________

3. The instrument used to measure mass is a triple beam balance

Bell Work 8/23/10

Please use complete sentences.

• What is mass?

• What instrument is used to measure mass?

Bell Work 8/24/10Please use complete sentences.

• 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

1. Shows a relationship between mass and volume

2. To calculate density we divide mass by volume

– d=m/v

3. 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=200kgv=2L

Temperature

1. Measured in degrees Celsius2. Instrument = Thermometer3. Freezing = 0 degrees Celsius4. 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

a. m = 20 g v = 4 mL

b. m = 60 kgv = 2 L

c. m = 8 g v = 8 mL

Weight

1. Weight is the measure of attraction between objects due to gravity.

2. Basic unit of weight is the Newton (N)

Bell Work 8/30/10Please 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?

Bell Work 8/31/10

1. 1000 g = ______ kg

2. 200 mL = ______ L

3. 1 m = ______ Dkm

4. 77 g = ______ mg

Bell Work 8/28/09

1. 25 kg = ______ mg

2. 345 cL = ______ HL

3. 980 m = ______ mm

4. 23700 g = ______ kg

Bell Work 9/1/10

1. 98 Hg = ______ mg

2. 222 KL = ______ L

3. 2706 mm = ______ Dkm

4. 5 g = ______ kg

Bell Work 09/2/10

What is the basic unit for the following?

1. Length2. Volume3. Mass

Bell Work 9/3/10

1. What is the abbreviation for cubic centimeters?

2. What number is the metric system based on?

3. What is used to measure the mass of objects?