In this lecture we are talking about engineering materials. When we are deciding on the various types to materials to use, we must consider under what circumstances is the finish product supposed to function. With that said, professor Halada suggests that we consider factors such as strength, toughness, hardness, chemical or corrosion resisstance, and density. These factors can all play a role in whether something functions properly in a life or death situation. In the case of the Titanic, I think we would want to focus on how brittle the material is. If a metal is hard but brittle, this can break under pressure. This leads us into talking about the atomic structure of various materials, as these can give the materials different properties. Not only can the way we manufacture these materials have an effect on them, but conditions which these materials find themselves in can also change their property. Things such as temperature, pressure, and strain should be taken into consideration when we are selecting appropriate materials. The professor also mentioned light weight being a property of some materials. These kind of properties are extremely important when we are talking about constructing an airplane, ship or even a spacecraft.