The speed of sound depends on the medium that the waves pass through, and is a fundamental property of the material. The first significant effort towards the measure of the speed of sound was made by Newton.
When the Occupational Safety and Health Act passed in 1970, steel-toe boots became a standard in the American workplace, preventing thousands of on-the-job injuries. Today's technology has only increased the variety of work boots available, and it's important to understand the differences before purchasing a pair.
What Are Alloy Toes? Most recently, Alloy toe safety boots have been gaining quite the loyal following. While they are as strong as steel, the only real difference is in the materials and components used in construction. Alloy toes are made from lightweight materials such as titanium, aluminum or a combination of other light materials.