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.
Safety Composite Toe Work Boots. No matter what line of work you are in, you need a pair of reliable shoes that gives you the stability to be on your feet. Some work conditions are more intense than others and require more durable shoes that are harder to weather. For those jobs we carry a wide selection of safety toe boots.