heat mat on the lid???

Hi,

I'm not sure this would be very effective, heat does tend to go up so you'd probably loose a lot of it. If you try it, I'd be happy to know how it worked.

Laurent

Wrong.
I learnt in my GSCE physics lesson that heat does not go up all the time.
Heat travels to places where the air is cooler. This may be by convection, conduction or radiation, this may be down, left, right or possibly up.

Actually Alisha, hot air rises above cold air because it is less dense, some will go down due to diffusion and stuff but the move averages out to an upward movement as the movement upwards is greater than the movement downwards. Its like a less extreme example of a helium balloon. (also the diffusion e.c.t. is why the heat spreads as it rises, it does go alittle bit left, right kinda thing)

I have physics A-level and am training to be a science teacher (currently doing a chemistry degree to go on to a PGCE).

Don't worry all the methods of heat transfer do get a bit messy.

convection current is like say you have a radiator, the air round it gets hot and rises, this air cools and then goes back down again to be heated by the radiator, hence creating a current. If you have curtains above a radiator you can sometimes see them move like being blown by te breeze, its the hot air rising that moves them. Don't worry about science, they teach you wrong stuff coz the reality is too complicated they just want you to get into a certain way of thinking, like in chemistry everything you learn at GCSE is wrong pretty much.

electrons in atoms is quite kool. like u said, they're not like planets round a sun. and the orbital diagrams that do exist just show electron density i.e. just where the electrons are most likely to be. theres s-orbital, which is spherical and p orbial which is like an 8 shape but 3D, a bit like monkey nuts still in there shell (penuts in shells) and then d orbitals which are just crazy, they're a bit like 2 of the p orbitals together, and f orbitals are even more crazy. its brilliant!

it is one of those cases where it's imposible to do an acurate diagram. merely diagrams to assit with the understanding of one aspect.
if you like physics without all the complicated maths i really recommend alice in quantum land (an allegory of quantum physics) by robert gilmore. it starts of with the basic stuff, up/down electrons etc and goes on as alice explores the world on the quantum level meeting various creatures and people and places (like classical physicists, quantum tunnelling rabbits etc, the energy bank, where things can borrow energy to come into existance etc) it can be read just as a story which gets the main ideas across but theres also info boxes with more information. it's great fun!
my GCSE physics was AWFUL just work out the amount you will spend on your electricity bill and rubbish like that. i only did it at A level because i knew it could be good. i really think instead of the rubbish i did at GCSE they should have just read us alice in quantum land, i really do.


Maybe quark finally got incredibly successful and once dead, in the true ferangi fashion, got cut up and sold off, maybe so many fakes etc were made they became the constituants of everything!
or maybe he only became the strange quarks...
one dreads to think the origin of bottom quarks...
Rom was more sucessful in engineering and invented CD-Roms....
or maybe not....
maybe everything is made from the cheese.....
but what about morn?