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thermometer step - Newest pictures
make.it.yourself.peperonity.net

|_Make A Thermometer_|

YOU WILL NEED
Water, bottle, food coloring, clear straw, reusable adhesive, card, scissors, felt-tipped pen.
STEP 1
Pour cold water into the bottle until it is about two-thirds full. Add some food coloring. Dip the straw into the water, and seal the neck tightly with reusable adhesive.
STEP 2
Blow down the straw to force some extra air into the bottle. After a few seconds, the extra air pressure inside will force the water level to rise up the straw.
STEP 3
Cut the card and slot it in over the straw. Let the bottle stand for a while. Make a mark on the card by the water level to show room temperature. Take your thermometer outside.
STEP 4
On a hot day, the sun’s heat will make the air and water expands, forcing the water level in the straw above the room temperature mark. Cool the thermometer in the fridge. Mark the different levels.


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