Which type of cup will keep a hot drink warm longer: paper, plastic , Styrofoam or glass?!

Question: another science fair question

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Answers: another science fair question

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If it were very hot to start with, the plastic would melt!! Styrofoam will keep it somewhat hot... but my grandmother served hot tea in a GLASS, with a knitted tea cozy around it (so you could hold it & it kept the heat in) .... Why don't you get an insulated coffee cup? Or a coffee cup warmer, to set your cup on?

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Styrofoam

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styrofoam

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The styrofoam because those cups have a way to hold the heat without releasing in it to the outside

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