OHAUS SB1200 Manual Instrucciones página 3

Hot Air/Cool Air
Objective
To determine which is heavier – hot air or cool air.
Materials
 Two 8
/2' x 11" cardboard tablet backs
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 Hair dryer or 75+ watt lamp bulb
 Small paper bags
 Ohaus SB1200 School Balance
Procedure
1. Place the cardboard pieces on each balance pan with a paper bag
upside down on each piece of cardboard. Zero the balance.
2. Remove one of the bags and place over the lamp bulb for 2-3 minutes,
being careful not to have the bulb touch the bag.
Using a hair dryer on high heat, fill the bag with hot air.
3. Without tipping the bag, place it back on the balance and observe the
zero point.
Notes
 Which is heavier, hot air/cool air?
 Why is this so? (molecular motion)
 Talk about hot air balloons, ceiling fans, furnaces in the basement,
molecular motion (solids, liquids. gasses)
Sugar in Soda
Objective
To show the relative amount of sugar in soda
Materials
 Same size can or bottle of regular and diet soda
 Sugar packets
 Ohaus SB1200 School Balance
EXPERIMENTS
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