Re: [Vo]:Imagine a teakettle

2011-02-10 Thread Jed Rothwell
Stephen A. Lawrence sa...@pobox.com wrote: Jed, it's a container, with all the walls at several hundred degrees C or higher; the bottom's in contact with the burner and is probably at about 1000 C. There is nothing inside the container except gas: Gaseous water. Yet you are claiming the

Re: [Vo]:Imagine a teakettle

2011-02-10 Thread jwinter
Hi Jed, What you wrote is true when there is liquid water and steam together in a container - the combination cannot be heated to a temperature higher than 100 deg C without raising the pressure. However once all the liquid has turned to gas there is no longer any limit to what temperature

Re: [Vo]:Imagine a teakettle

2011-02-10 Thread Jed Rothwell
jwin...@cyllene.uwa.edu.au wrote: What you wrote is true when there is liquid water and steam together in a container - the combination cannot be heated to a temperature higher than 100 deg C without raising the pressure. However once all the liquid has turned to gas there is no longer any

Re: [Vo]:Imagine a teakettle

2011-02-10 Thread Stephen A. Lawrence
On 02/10/2011 08:28 AM, Jed Rothwell wrote: jwin...@cyllene.uwa.edu.au mailto:jwin...@cyllene.uwa.edu.au wrote: What you wrote is true when there is liquid water and steam together in a container - the combination cannot be heated to a temperature higher than 100 deg C

Re: [Vo]:Imagine a teakettle

2011-02-09 Thread Jed Rothwell
Stephen A. Lawrence sa...@pobox.com wrote: The kettle is still filled with water vapor -- dry steam -- and the pressure inside is still 1 atmosphere, give or take a few millibars. What temperature do you suppose the steam inside the kettle is at? Could this be -- gasp! -- an example of

Re: [Vo]:Imagine a teakettle

2011-02-09 Thread Stephen A. Lawrence
On 02/09/2011 09:43 PM, Jed Rothwell wrote: Stephen A. Lawrence sa...@pobox.com mailto:sa...@pobox.com wrote: (I'm going to put back a few lines you snipped, just for context clarity:) After a while, all the water boils to steam. The kettle is still filled with water vapor, of course! But

RE: [Vo]:Imagine a teakettle

2011-02-09 Thread Mark Iverson
Although this discussion thread is really a moot point after it was pointed out that there are 5 PLCs which are controlling the power to the resistive heaters, there's one thing I'd like to point out... Stephen said: Jed, it's a container, with all the walls at several hundred degrees C or

Re: [Vo]:Imagine a teakettle

2011-02-09 Thread Charles Hope
pV = nRT. If the temperature increases, there must be a corresponding increase in the pressure or the volume (or both). In this tea kettle case, the volume of the steam increases right out the top of the kettle. But the temperature can increase above 100. Sent from my iPhone. On Feb 9,