learn

1. Measurement
of mass
Physics presentation

2. 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

3. 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

4. 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

5. Tools for measuring Mass
• The triple beam balance

6. 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!

7. Beam balance

8. 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

10. 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?

11. Complete the table
Unit
Fematogram
Picogram
Nanogram
Microgram
Symbol

13. Done by,
Akhil and group