Chlorpheniramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Chlorpheniramine is used to treat runny nose, sneezing, itching, and watery eyes caused by allergies, the common cold, or the flu.
The mean orbital velocity of Earth is about 29.783 kilometers per second. That's the speed the planet is moving through space in its orbit about the sun. Earth's speed varies a bit because its orbit is slightly eccentric, but that's why we say mean orbital velocity. One can calculate this value by knowing two facts:
In such a case we speak of orbital space flight. The velocity required to stay in an orbit is called orbital velocity and depends on the altitude of the orbit. For a 200 km circular orbit the orbital velocity is 7780 m/s (28000 km/h or 17400 mph). It is actually this incredibly high speed which makes. space flight technically so complex and therefore expensive.