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.
Propolis is a sticky, gummy and resinous material collected by honey bees from buds and the bark of trees and shrubs. The bees use this material to fill cracks, reduce openings to their hive and coat the entire inside to help protect it from disease.