PLEASE COULD U HELP WITH SCIENCE COURSEWORK

What's your best guess on how they do it? Don't worry about being formal, just type your ideas out.

Joe

i dont know apart from it keeps the heat in but it is really annoying me

The heat of your annoyance is getting in the way of the coolness of your head.

How do convection and conduction differ? Which one matches how the wool or cotton work? If neither, how else could it happen.

Cool down and understand heat.

Joe

conduction and convection are just examples but here goes...conduction is when heat passes to colder regions of a material, in my case the heat would conduct from the beaker to the table...convection is the concept of heat rising to cooler regions and cooler air taking the place therefore a convection current looks like a continuous circle or square depending on where it is, in my case heat is lost through the top of the beaker...neither insulator controls conduction or convection because to reduce them i have a heat proof mat at the bottom and a paper lid at the top...there are 2 other types of heat loss (radiation, evaporation) but neither can be controled ny the cotton wool or the woolly jumper

Why not?

Now, we are getting somewhere.

radiation heat loss is when heat is lost through the glass beaker, there is an insulator that reduces heat loss via radiation, foil which acts as a mirror reflecting back these waves of radiation...evaporation is when water vapour molecules leave the surface of the water they go upwards again covered by the paper lid

The heat loss throught the beaker is conduction. The heat loss from the surface of the beaker after the heat is conducted through its material is radiation. The wooly jumper reduces the heat loss due to radiation, and is a poor conductor of heat itself. So, in fact, the wooly jumper is keeping the beaker warm by reducing radiation, and the beaker thereby keeps the water warm because of the reduction of heat being conducted through the material of the beaker.

thanks for your help but how is heat loss reduced with the cotton wool?

The same way, you just have to compare your results (degrees of heat loss per [minute?]) to see which one is the more effective insulator.

Joe

Hey Joe (not the tune) -- you're good at this. great bio, too, by the way...

Thanks.

Joe