Warm-Up: Thursday, October 9 , 2008

The bowling ball and the balloon take up the

same amount of space ( have equal volumes ) Do equal volumes of different substances

always have the same mass? on

Triple Beam Balance

Used to Measure Mass

Parts of the Triple Beam Balance

PAN

ZERO/ TARE KNOB

MOVEABLE MASSES

BASE

BEAMS

BALANCE

POINT

A Closer Look at the Beams

10 gram beam

100 gram beam

1 gram beam

Converting g to mg

1 g =1,000mg

(1 gram = 1,000 milligrams)

When changing grams to milligrams, the decimal is moved 3 places to the RIGHT

Example:

50.0 grams=50,000.0 milligrams

Practice reading the mass on the Beams

1. If the middle beam is on 400g, the back beam is on 50g and the front beam is on 7g, what is the total mass in grams? Mg? Kg?

2. If the middle beam is on 200g, the back beam is on 20g and the front beam is on 5.2g, what is the total mass in grams? Mg? Kg?

3. If the middle beam is on 500g, the back beam is on 10g and the front beam is on 1.2g, what is the total mass in grams? Mg? Kg?

Power Point presentation made by

Ms. Luck.