Related terms: PVD, peripheral arterial disease, PAD, venous thrombosis, deep vein thrombosis, DVT. Peripheral vascular disease (PVD) involves damage to or blockage in the blood vessels distant from your heartâthe peripheral arteries and veins.Your peripheral arteries and veins carry blood to and from your arm and leg muscles and the organs in and below your stomach area.hen PVD affects only the arteries and not the veins, it is called peripheral arterial disease (PAD). The main forms that PVD may take include blood clots (for example, deep vein thrombosis or DVT), swelling (inflammation), or narrowing and blockage of the blood vessels.
THE VELOCITY OF LIGHT AND MAXWELL'S CONSTANT. The use of the velocity of light, or more generally, the velocity of propagation in vacuum of the electromagnetic waves as a fundamental constant, comes from James Maxwell's Electromagnetic Theory.
As a result of this definition, the value of the speed of light in vacuum is exactly 7008299792458000000â 299792458 m/s and has become a defined constant in the SI system of units.ccording to special relativity, c is the maximum speed at which all matter and information in the universe can travel. It is the speed at which all massless particles and changes of the associated fields (including electromagnetic radiation such as light and gravitational waves) travel in vacuum.