About 2/3 of the population speak German; French is spoken in the west of the country, while Italian is spoken in the canton of Ticino and Romansh in parts of GraubÃ¼nden. The capital of Switzerland is Bern. The largest city of Switzerland is ZÃ¼rich. To the north of Switzerland is Germany.
insulating board so that the entire portion is approximately 4 inches long. The nichrome wire produces heat rapidly with an electric current due to the high level of electrical resistance that the twisted wire holds. This preview has intentionally blurred sections.
The Science of Heat Tweet. On a hot summer day, telephone wires sag between the poles that hold them up. Yet, on a cold day, the wires are tightly stretched. The reason is that most substances expand as they get hotter, and contract, or shrink, as they cool down. Metals, when heated, expand more than other kinds of solids do. Because of this, engineers have to be especially careful when designing and building large metal structures. For example, narrow gaps must be left between railroad tracks at regular intervals. This prevents the tracks from buckling during hot weather.