Here's a Question! - Mass of Burning Paper
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- Опубліковано 9 кві 2023
- Strips of paper are placed in a beaker. The beaker is placed on a scale and the total mass is measured. Then, the paper is then set on fire. Once the fire burns itself out, the total mass is measured again. How will the masses compare?
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Now try the same experiment with steel wool instead of paper. 🔥
Funny you should mention... This will be happening next week.
I knew it would lose mass, but I wasn't sure it would be enough to show on the scale. I was a bit surprised at how much!
Who else was expecting to see it burning sited on the scale, while filming how the weight changes?
:o)
And that was a thought of how to do it. However, the scales we use turn off after about 30 seconds if there isn't some sort of obvious change. And, when they are turned back on, they set their zeros based on whatever is on them. So, if they happened to turn off during the burning, we'd lose the reading. And, as it turns out, an unventilated beaker makes a lousy burn barrel. What's shown in the video took about 6 minutes with near constant blowing into the beaker to keep the fire going. So, even if the scale had happened to have stayed on, the readings would have been all over the place.
A! Some of the carbon in the paper will be transformed to carbon monoxide gas and carbon dioxide gas. As the gas is lighter than the solid paper, the beaker will weigh less after the paper has been burned to cinders
Mass and weight are actually two different things. However, it is common practice to use the weight of an object to determine it's mass. The formula is: force (weight), equals mass times the acceleration due to gravity, (per Sir Issac Newton, circa 1665). So to determine the actual mass, it is necessary to divide the weight of the object by 32..174 feet per second squared. When you do this you can see that there is a significant difference between pounds force and pounds mass. Another thing to consider is that the acceleration due to the earth's gravity can vary slightly, depending on the location. Maximum near the poles and minimum near the equator.
The scale is calibrated with a certain set of assumptions. Namely, that it's on the surface of the Earth, level to the ground and not undergoing accelerated motion. So, it's doing the math you describe to arrive at a reading for the mass. If we were to use a balance (which actually does provide a measure of mass) rather than the scale, the results would be the same. Just less convenient.
@@JeffersonLab Thank you for addressing this, and I totally agree. It has always confounded me that metric scales can read out kilograms and it is easy to call that mass because the definition of a kilogram of mass is that amount of mass that exerts a vertical force of one kilogram on the surface of the earth. But really, the metric unit of force is a newton and you don't usually see a metric scale that reads out in newtons. Now switch to the English system of measurement. One can easily make the mistake of weighing an object on a scale and then saying that it has a mass of that many pounds. That would be wrong. I can see why, when, say a person is being trained in a chemistry laboratory, the scales are calibrated in metric units. Also, it is understandable why the periodic table shows the atomic mass of the elements in grams and not ounces.
Mhmmm