We make the students pay 50p for any cups they puncture - they are advised of this at the start of the practical. Always get the argument - "there's no way they cost 50p", to which I reply "you're right, there's an hour of my time to drive into town and back, plus my petrol, plus the car park charge, plus the cost of the cup...would you feel more comfortable paying £2.50 to cover all the costs incurred due to your carelessness?", they usually pay up straight away!We used this yesterday, though I think it raises the risk of puncture because the cups don't go to the bottom of a 250ml beaker. 400ml they probably would.
I have a set of doubled polystyrene cups glued together with lids cut from flat polystyrene sheet with hole for thermometers. Only used by year 12 chem and have lasted for years. Also stand them in beakers for stability.No not Latent Heat, Hess's Law of Thermodynamics.
it's pity polystyrene ceiling tiles have gone out of fashion....I have a set of doubled polystyrene cups glued together with lids cut from flat polystyrene sheet with hole for thermometers. Only used by year 12 chem and have lasted for years. Also stand them in beakers for stability.
True but it's not necessarily the results we're looking to influence so much as introducing the concept of reducing loss/controlling variables which will be questioned on the exam paper laterWe do this and dont use lids as to be honest it makes very little difference. Experiments are very quick so any heat loss is minimal.
I went to our local posh coffee shop asked if I could have 20, manager gave me a pack.Hi all,
I always get requested of polystyrene cups with lids, but I couldn't ever find such lids to buy at the street shops where I buy this polystyrene cups,
So what can I put instead?