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.
Apis mel. is derived from the honeybee-the whole bee is used. Propolis, a resin-type substance secreted by bees to repair damage to hive walls, has been used for centuries as a natural antibiotic.