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: The [[Boiling Point|boiling point]] of an [[alkane]] depending on the number of [[Carbon]] [[atom]]s in that [[alkane]]: The number of [[Carbon]] [[atom]]s is a '''discrete variable''' because you can't have half an [[atom]].
: How the shoe size depends on the size of people's feet: The shoe size is a '''discrete variable''' because there are no sizes between 7 and 7.5.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Discrete variables, page 260, GCSE Physics; Third Edition, Oxford University Press, AQA '']