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Measuring in the Science Laboratory. T. Trimpe 2008 http://sciencespot.net/. Measuring Length. Length- is measured with a ruler or a meter stick. Common units for length are meters, centimeters, millimeters . How many millimeters are in 1 centimeter?. 1 cm = 10 mm.

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slide1

Measuring in the

Science

Laboratory

T. Trimpe 2008 http://sciencespot.net/

slide2

Measuring Length

Length- is measured with a ruler or a meter stick.

  • Common units for length are meters, centimeters, millimeters.

How many millimeters are in 1 centimeter?

1 cm = 10mm

Ruler: http://www.k12math.com/math-concepts/measurement/ruler-cm.jpg

slide3

Measuring Volume

Volume is the amount of space an object takes up.

There are 3 different ways to measure volume:

A. Volume of a liquid

B. Volume of a regular solid

C. Volume of an irregular solid

A B C

slide4

A. Measuring Volume of a Liquid

We will be using a graduated cylinder to measure the volume of liquid.

  • First, place the graduated cylinder on a level surface. The surface of the liquid will form a curve called the meniscus.
  • The volume is read from the bottom of the
  • meniscus.
  • When using a graduated cylinder, make sure you are at eye-level with the level of the water.
  • The units used when measuring with a
  • graduated cylinder are called milliliters.

Top Image: http://www.tea.state.tx.us/student.assessment/resources/online/2006/grade8/science/images/20graphicaa.gifBottom Image: http://morrisonlabs.com/meniscus.htm

slide5

9 cm

8 cm

10 cm

B. Measuring Volume of a Regular Solid

We can measure the volume of regular object using the formula length x width x height.

  • The units when measuring a regular solid are cm3.

10 cm

9 cm

720 cm3

8 cm

_____ X _____ X _____ = _____

slide6

http://resources.edb.gov.hk/~s1sci/R_S1Science/sp/en/syllabus/unit14/new/testingmain1.htmhttp://resources.edb.gov.hk/~s1sci/R_S1Science/sp/en/syllabus/unit14/new/testingmain1.htm

Amount of H2O with object = ______About of H2O without object = ______Difference = Volume = ______

C. Measuring Volume of an Irregular Solid

We can measure the volume of irregular object using water displacement.

  • When an object is submerged in water, the water level will rise. The amount the water level rises is equal to the volume of the object.
  • This is called displacement.
  • The units when measuring an irregular solid are millimeters.

69 ml

65 ml

4 ml

  • Why is this method accurate?

1 ml = 1 cm3

slide7

Temperature

  • Temperature is measured with a thermometer.
  • Do not shake the thermometer down before using.
  • Measure temperature by leaving the bulb of the thermometer below the surface of a liquid.
  • Do not let thermometer touch bottom or sides of container. (See diagram in notes)
  • Read the thermometer at eye level. Watch column in the thermometer unit it stops moving.
  • Units for temperature are degrees Celsius (0C)
slide8

1 fl oz = 29.573 ml

1 12-oz can of soda would equal approximately 355 ml.

1 quart = 0.946 liters

1 gallon = 3.79 liters

It would take approximately 3 ¾ 1-liter bottles to equal a gallon.

English vs. Metric Units

Which is larger?

A. 1 liter or 1 gallon

B. 1 liter or 1 quart

C. 1 milliliter or 1 fluid ounce

slide9

Measuring Liquid Volume

What is the volume of water in each cylinder?

Images created at http://www.standards.dfes.gov.uk/primaryframework/downloads/SWF/measuring_cylinder.swf

A

B

C

Pay attention to the scales for each cylinder.

slide10

kL

Metric Units

cL

mL

L

Volume is the amount of space an object takes up.

The base unit of volume in the metric system in the liter and is represented by L or l.

Standard: 1 liter is equal to one cubic decimeter

Metric Units

1 liter (L) = 1000 milliliters (mL)

1 milliliter (mL) = 1 cm3 (or cc) = 1 gram*

Which is larger?

Click the image to watch a short video about volume.

A. 1 liter or 1500 milliliters

B. 200 milliliters or 1.2 liters

C. 12 cm3 or 1.2 milliliters*

* When referring to waterLiter Image: http://www.dmturner.org/Teacher/Pictures/liter.gif

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