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Metric Measurement

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... in a tube that is closed and put graduations on that tube, you can ... 2. Thermometers that have a red or blue liquid in them are alcohol thermometers. ... – PowerPoint PPT presentation

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Title: Metric Measurement


1
Metric Measurement
  • Reading Measurement Instruments

2
Reading a Metric Ruler
3
Reading a Metric Ruler
  • In the metric system, we always use decimals,
    never fractions. You must always include a unit
    like centimeter in your answers. You may use
    abbreviations. Below are some abbreviations for
    common metric linear measures.millimeter--mm
    centimeter--cm decimeter--dm meter--m
    kilometer--km

4
Reading a Metric Ruler
On a piece of paper, write the answers to the
lettered arrows.
5
Reading a Graduated Cylinder
  • 1. A graduated cylinder is used to find the
    volume of a liquid. The volume tells you how much
    space that liquid occupies.
  • 2. The marks on the cylinder are called
    graduations. That is why the instrument is called
    the graduated cylinder. Each mark on this
    cylinder is worth one milliliter, a basic unit
    of measure for the volume of a liquid. A unit for
    larger volumes is the liter.

6
Reading a Graduated Cylinder
  • 3. The graduations on a cylinder are not always
    worth the same. Before using the cylinder, you
    need to figure out what each graduation is
    worth.
  • 4. When a liquid is put into a cylinder, the
    surface curves. This curve is called a meniscus.
    When reading the volume of a liquid, always read
    at the bottom of this curve while holding the
    surface at eye level.
  • 5. The abbreviation for milliliter is mL. A
    capital L is used so that it is not confused with
    the number "1".

7
Reading a Graduated Cylinder
  • The lettered arrows on the diagram to the left
    point to volume measurements. Arrow "A reads 48
    mL. Write the answers to the other arrows on a
    piece of paper.

8
Reading a Thermometer
  • 1. Thermometers work because as liquids get warm,
    they expand as they cool, they contract. If you
    put a liquid in a tube that is closed and put
    graduations on that tube, you can measure the
    change in the height of the column of liquid, and
    thus the change in temperature.
  • 2. Thermometers that have a red or blue liquid in
    them are alcohol thermometers. Mercury is a
    silver liquid. These kinds of thermometers can be
    dangerous.

9
Reading a Thermometer
  • 3. The two common scales found on thermometers
    are Celsius and Fahrenheit. Scientists use the
    Celsius scale.
  • 4. Thermometers are calibrated using temperatures
    that are known and don't change. For example, the
    boiling point of water is 100 C. If you put a
    blank thermometer in boiling water, it would go
    to the level that would indicate 100 C.

10
Reading a Thermometer
  • Each graduation on your thermometer is worth one
    degree Celcius. Celcius is abbreviated C. On the
    thermometer to the left, there are arrows
    pointing at several readings. Write the answers
    on another piece of paper.

11
Reading a Balance Scale
  • Be sure all riders are at zero.
  • Move the riders beginning with the largest mass
    first until the scale is balanced.
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