| Category | Format | Size |
|---|---|---|
| Zhejiang Education Edition Seventh Grade Science Volume 1 | pptx | 6 MB |
"Scientific Measurement" PPT
Description
"Scientific Measurement" PPT
Part 1: What is measurement
take a look
Once, the king asked Afanti: "Everyone says you are extremely wise, but do you know how many barrels of water there are in the canal in front of you?"
Afanti said: "If this bucket is as big as this canal, then there is only one bucket of water. If this bucket is half as big as this canal, then there are two buckets of water. If this bucket is as big as this canal, there are only two buckets of water." If it is one-tenth the size, then this canal will have ten barrels of water..."
Think about it, how does Afanti measure how much water is in the canal?
measurement concept
Measurement is the process of comparing a quantity to be measured to an accepted standard.
Thinking: When we measure certificates, what is the quantity to be measured and what is the recognized quantity?
Scientific Measurement PPT, Part 2: Unit of Length
Please tell me the unit of length you know.
Meter (m), kilometer (km), centimeter (cm), decimeter (dm),
Micron (μm), nanometer (nm), millimeter (mm)
Nanometer (nm), micron (μm), millimeter (mm), centimeter (cm),
Decimeter (dm), meter (m), kilometer (km)
Unit conversion
1 kilometer = 1000 meters, 1 meter = 100 centimeters = 10000 millimeters
1 millimeter = 1000 microns, 1 micron = 1000 nanometers
1 meter = 1,000,000 microns
1 meter = 1000000000 nanometers
A nanometer is a very small unit of length, equivalent to one sixty thousandth of the diameter of a human hair, and a micron is one sixtieth of the diameter of a human hair. How many nanometers is the diameter of a human hair?
Practice questions
Which of the following unit conversions is correct ( )
A. 1.5 meters = 1.5*1000 = 1500 mm
B. 1.5 meters = 1.5 meters * 1000 = 1500 millimeters
C. 1.5 meters = 1.5 meters * 1000 mm = 1500 mm
D. 1.5 meters = 1.5*1000 mm = 1500 mm
Scientific Measurement PPT, Part 3: Measuring length correctly
1. Choose
Observe the measuring range and minimum scale and choose the appropriate measuring tool.
Take a look at the range and minimum division of your scale.
2. Put
The 0 scale line is aligned with a section of the object being measured, and the scale is as close as possible to the object being measured.
3. Look
The line of sight is perpendicular to the scale.
4. Read
summary
90mm=9*107nm
70 decimeter = 7000 mm
32 microns = 0.032 mm
51000 nanometers=5.1*10-5 meters
1,200,000 microns = 120 centimeters
90 nanometers = 0.09 microns = 0.00000009 meters
Scientific Measurement PPT, Part 4: Use of Scale
before use
Look at the range and minimum scale of the scale
when using it
Place it correctly: the 0 scale line is aligned with one end of the object being measured, and the scale is as close as possible to the object being measured.
See it correctly: the line of sight is perpendicular to the scale
Correct reading: exact value + estimated value + unit
Remember correctly: record correctly
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Update Time: 2024-06-23
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