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The marks form a graduated scale of weight units. Weigh object...
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Shining a desk lamp into the jar and waiting for the temperatu...
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Push the open end of each straw into a hole in the bottle. The...
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This model thermostat senses temperature-related expansion and...
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A model of the stitching mechanism of a sewing machine demonst...
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Shine a desk lamp into the jar and wait until the temperature ...
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Using a dropper to place a drop of water on the open palm of a...
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Open palms of a pair of hands.
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Ice cubes in a plastic ice-cube maker.
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Plastic jars with lids, cork coaster, aluminium foil.
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Wrap a piece of foil around the large jar and one small jar. F...
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Place a cork coaster in the bottom of the large jar.
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Place the small foil-wrapped jar on top of the coaster inside ...
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Put an identical number of ice-cubes inside each small jar and...
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Wait until the ice in the jar with no foil wrapping has almost...
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Plastic bottle, 2 drinking straws, round file, large plastic b...
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Using a file to enlarge the holes made in a plastic bottle.
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Cut two straws to 15 cm in length. Usng compasses, piece holes...
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Cut a 10 cm length of wire. Bend it over and tape it to the ne...
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Push the open end of each straw into a hole in the bottle. Imm...
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