Wood GlassCopperNylonNickelPolystyreneCardboardSteel Perspex- I dun know what the hell it isHow many are there for conductor of heat?Mine answer: Three
All the above are conductors of heat, some better than others and some really poor. But ultimately they *ALL* conduct heat. Good conductors are copper, steel, nickel, glass. Umm glass poor conductor? HA! See if you can hold a glass full of hot liquid. It's not as good as other materials but it's NOT an insulator. Hint: that's why efficient windows have a layer of air or gas sandwiched between 2 sheets of glass. Material Thermal conductivity [W/mK] ---------------------------------------. Copper 401 Nickel 91 Steel, Carbon 1% 43 Glass 1.05 Nylon 6 0.25 Perspex glass 0.19 Wood across the grain, white pine 0.12 Polystyrene, expanded 0.03
the most common way is if the wheel is a spoke wheel, then it has a tube in it, this is because there is now way to seal the wheel where the spokes come thru the center of the wheel, so you've got a rim strip and a tube. Now that said, that does not mean all mag wheels don't have a tube in them, but most commonly mags don't have tubes and spoke wheels do have a tube. also the side of the tire should say tubeless if it is,,,tubeless
I'm not sure of a certain tread depth, but tell her to look for cracks in the sidewalls.
among these, copper, nickel and stell are conductors, but wood and glass are pure insulators,
listen if she doesnt know if they are good dont buy the bikeits probably trash. if she doesnt know shi*t about tires do u think she will have taken care of other things? does she know how to put gas in it???? ask her how deep the treads are and any cracks.id just look for yourself
