Recent content by robcowen

What do you mean by this? I've done some calculations of the theoretical pressure (pV=nRT) and get a gradient of 346 (as opposed to 42 for the experimental results). I've also built into my calculations an allowance for the change in volume of the air within the manometer - this changes the...

That is something that concerned me, although I would expect a changing volume to cause the line to curve. The temperature measurement may also be a source of error. I did have a thermometer in the boiling tube, but decided instead to use the one in the water bath. This was because the gas...

I am a high school physics teacher and I've been trying out an experiment for my students. I used a manometer (a plastic tube in a U-shape partially filled with water) to measure the pressure of the air in a boiling tube. I placed the boiling tube into a beaker of water and varied the...