Background Examples
Average: Missing why people care, detailed explanation of subject matter and statement of question
Boyle’s law states that as the volume of a gas goes up, the pressure of a gas goes down. A gas is a type of matter that has no definite volume or shape. This means that the pressure changes in the opposite direction of the volume. Charles’ Law says that when the temperature of a gas goes up, the volume of that gas also goes up. This means that temperature and volume always change in the same direction. In this experiment, when the temperature of the gas is increased, the volume will go up which will cause the pressure to go down according to both Charles’ and Boyle’s Laws.
Below Average: Missing substantial amounts of information, starts out very narrow, does not really complete any thought.
In this experiment it will be found how temperature and pressure are related. People use pressure cookers, and those use pressure to heat and cook food. Charles and Boyles Laws explain gas behavior. According to these laws, it is expected that when the temperature is increased, the pressure will also increase.
Excellent: Fully explains everything necessary to understand the experiment
People are exposed to gases and gas behavior everyday. The earth’s atmosphere is entirely composed of gas, car tires are filled with gas, and many invaluable machines operate based on gas laws; just to name a few ways in which people interact with gas in their everyday lives. This extensive interaction means that it is beneficial for people to understand as much about how a gas behaves as is possible. There has been much research on this topic throughout history. A gas is a type of matter that has no definite shape or volume because its particles have enough energy to escape their attractions to each other (McLaughlin 2008). This makes gases unique in the distance between their particles. Boyle was a scientist who worked with gases and discovered that as volume of a gas is increased, the pressure exerted by that gas goes down. Charles was another scientist who experimented with gas. He discovered that as you increase the temperature of a gas, the volume goes up. Both of these laws can be explained using an understanding of gas particle behavior. For Boyles law, as the volume goes up, the particles have more room to move around, and thus hit the wall less often, exerting less pressure (the force of the particles hitting causes pressure). Charles law can be similarly explained – as the temperature goes up, the gas particles have more kinetic energy (they move faster) and so they are able to get further away from each other – overcoming their attractions even more than before. In this experiment, to goal is to discover the relationship between temperature and pressure – one not explained by either law. This will be done by heating a gas in a rigid (where volume is constant) container. It is expected that as the temperature increases the speed of the particles will increase. This should cause the particles to hit the walls of its rigid container more often, causing the pressure in that container to increase.
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