if had a styrofoam cup and liquid nitrogen was added to the cup and then recorded the mass vs time on a graph. And then had a stryofoam cup that had a wider mouth and liquid nitrogen added to the cup and then recorded the mass vs time on a graph. Would the slope of the graph be greater, shallower, or the same for the cup that had the wider mouth??
2007-07-15 17:25:33 · 2 answers · asked by lola 1 in Science & Mathematics ➔ Physics
The process by which the cup+liquid system loses mass is evaporation.
Since evaporation can only take place at the surface of a liquid, the more surface area the liquid has, the faster it can evaporate. A cup with a wider mouth allows more surface area of the liquid to be exposed to the air. Therefore, the liquid nitrogen will evaporate faster in the wide-mouthed cup. Faster evaporation means the mass changes more quickly, so the slope of a mass-vs.-time graph would be greater for the wide-mouthed cup.
2007-07-15 17:31:09 · answer #1 · answered by lithiumdeuteride 7 · 0⤊ 0⤋
The wider mouth would evaporate the nitrogen more rapidly, so its weight graph would have a steeper slope.
2007-07-16 00:36:57 · answer #2 · answered by Anonymous · 0⤊ 0⤋