Measurement
Reading a thermometer
Read ten thermometers over four selectable signed ranges in Fahrenheit or Celsius, including odd-degree values halfway between 2-degree marks.
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Reading a barometer
Read nine original pressure dials in inches of mercury, millibars or a balanced mix, recording the setting, measuring reading and pressure trend for twenty-seven responses.
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Read the setting and measuring hands on all nine dials, then identify whether pressure is increasing or decreasing.
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What this activity builds
Read a circular pressure scale exactly and compare two marked readings to identify an increasing or decreasing trend.
Worked example
The setting hand reads 29.8 in Hg and the measuring hand reads 30.1 in Hg. What is the trend?
Increasing
The measuring reading is greater than the setting reading, so the pressure trend is increasing.
Teaching notes
Make the practice count
- Use the dashed open hand for the setting and the solid filled hand for the measuring reading.
- Name the minor interval before reading the pointer.
- Both units mode mixes separate in Hg and mbar dials; it is not a conversion exercise.
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