In typical rockets the mass ratio is between 10 and 30. Imagine a rocket with a total mass of 1 ton and a mass ratio of 1000: when empty, it would only weight one kg, including its cargo, while when full it would need to contain 999 kg of fuel!
Benefits of Bee Propolis For Skin Apparently, natural bee propolis is considered good for younger, acne prone skin, as well as more mature skin. Itâs now being used as a wrinkle fighter by what seems to be a growing number of women.
What is Propolis? Propolis is a natural resin collected from the buds of conifers and other trees by honeybees. It is used by bees to seal walls and strengthen combs of hives, as well as to embalm dead invaders. It is a sticky, greenish-brown mass with a slight aromatic odor. Slideshow.