Filter (OIL )- A device which removes solids from a fluid. Flow Meter - A testing device which gauges either flow rate, total flow, or both. Flow Rate - The volume of fluid passing a point in a given time. Fluid Power - Energy transmitted and controlled through use of a pressurized fluid. Force - A push or pull acting upon a body.
Conflicts of national interest caused the World War II alliance between the United States and the Soviet Union to be replaced by a Cold War that lasted 45 years. Initially a dispute over the future of Europe, it grew to include confrontations around the world.
World War I (or the First World War) was a global war which began on July 28, 1914 and lasted until November 11, 1918. The war lasted exactly four years, three months and 14 days. Most of the fighting was in Europe, but soldiers from many other countries took part, and it changed the colonial empires of the European powers.