"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: 2024-11-25

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