chem. question?

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why must objects be cooled before their mass is determined on a sensitive balance?

2007-11-01 13:52:59 · 3 answers · asked by Tina 1 in Science & Mathematics ➔ Chemistry

3 answers

Because hot objects will heat the air in the balance chamber, leading to convection currents that will "move things around."

2007-11-01 13:57:08 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋

Because the warmth of the object being warmer than the surrounding air can develop air currents which swirl around the object. With a sensitive balance, these current movements have an effect on the downward pressure of the object on the balance pan.

2007-11-01 13:58:59 · answer #2 · answered by vv 6 · 0⤊ 0⤋

because with some objects heat could cause the object to expand adding volume and mass.

2007-11-01 13:57:20 · answer #3 · answered by Anonymous · 0⤊ 1⤋