measuring mass
TRANSCRIPT
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Measurement of mass
Physics presentation
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Measuring Mass• Mass is the amount of matter in an object
• Matter is some thing that has mass and takes up space
• Measurement of mass one of the mist frequently carried out operation
• Accurate mass measurement required for such purpose as
- Obtain a known quantity of Sample for analysis
- Preparation of analytical reagents
- Preparation of calibration standards
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Units for measuring mass
• In the international system (SI) of measurement unit base unit of mass is the kilogram (Kg)
• Kilogram is one of the seven base measurement units
• In routine analytical work, it is more convenient to work in terms of grams (g) where 1000 g = 1 Kg or 1 g = 10-3 Kg
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MASS MEASUREMENT
• Other sub-division and multiples of the gram are
Unit Symbol Relationship to the gram
Fematogram fg 1fg = 10-15 g
Picogram pg 1pg = 10-12 g
Nanogram ng 1ng = 10-9 g
Microgram Mg 1Mg = 10-6 g
Milligram mg 1mg = 10-3 g
Gram g 1g = 1 g
Kilogram kg 1Kg = 103 g
(metric) tonne t 1t = 106 g
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Tools for measuring Mass
• The triple beam balance
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How to use a triple beam balance
• 1) Make sure that the balance scale is at zero.
• 2) Place object on balance scale the larges and move the largest rider one notch at a time until the beam drops. Move the rider back one notch (make sure it lock in place)
• 3) Move the next largest rider until the beam drops. Back it up one notch.
• 4) Move the smallest rider until the beam swings equally above and below the zero mark.
• 5) Add up all the numbers to find the mass!
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Beam balance
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Mass Vs Weight
Mass does not depend on gravity
The mass of an object always remains the same
Weight depends on gravity
Weight equals Mass X gravity
The weight of an object changes if the pull of gravity changes
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Answer the following
• _________does not depend on gravity.
• ______________of an object changes if the pull of gravity changes.
• Name any 2 tools used to measure mass.
General questions…
• What is gravitational pull? In what way weight has a relation with the gravitational pull?
• What is weight?
• What is matter?
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Complete the table
Unit
Fematogram
Picogram
Nanogram
Microgram
Symbol
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Done by, Akhil and group