This schlieren photograph shows that air coming in contact with a goblet filled
with warm water warms up and rises as a result of increase in
temperature.
In the lower picture, the goblet was simply filled with coffee out of a freshly made pot of coffee from a coffeemaker for making
its surface hot (left), and with ice and water to make its surface cold (right).<\p>
Contributor: Prof. Andrew Davidhazy, Rochester Institute of Technology (Copyright
retained by the contributor, as usual).
