The Airborne Collision Avoidance System II (ACAS II) was introduced in order to reduce the risk of mid-air collisions or near mid-air collisions between aircraft.It serves as a last-resort safety net irrespective of any separation standards.he safety benefits delivered by ACAS are usually expressed in terms of the risk ratio (does ACAS make safety better or worse?). For Europe, ACAS is estimated to reduce the risk of mid-air collision by a factor of about 5 (i.e. a risk ratio of 22%).
Quick Answer. Tungsten is the element used in incandescent light bulb filaments, because it has a very high melting point. Tungsten is a metal with an atomic number of 74, and its atomic weight is 183.84 grams per mole. This metal has a melting point of 6192 degrees Fahrenheit.
Incandescent Bulbs Light the Way. Long before Thomas Edison patented -- first in 1879 and then a year later in 1880 -- and began commercializing his incandescent light bulb, British inventors were demonstrating that electric light was possible with the arc lamp. It was a series of small improvements on the ideas of previous inventors that have led to the light bulbs we use in our homes today. 2  Learn more about the history of the incandescent light bulb. 3  Explore the history of fluorescent lights, from the Geissler tube to CFLs. 4  Read about the advancements in LED lights.