Brass is a homogeneous mixture (solid solution) of copper and zinc. Again each metal by itself is a pure substance. Only when they are mixed are they a homogeneous mixture (or solid solution). Heterogeneous Mixtures Heterogeneous mixtures are not uniformly mixed on an atomic or molecular level.
Penrose is one of the small villages in the Southern Highlands, located between Bundanoon and Marulan.
About Your Penrose Drain. A Penrose drain is a soft, flat, flexible tube made of latex. Part of the drain will be inside your incision (surgical cut), and part of it will come out of your skin. A safety pin or a small tab is usually left at the end of the Penrose drain to keep it from slipping into the wound (see Figure 1).