A liquid-propellant rocket or a liquid rocket is a rocket engine that uses propellants in liquid form. Liquids are desirable because their reasonably high density allows the volume of the propellant tanks to be relatively low, and it is possible to use lightweight pumps to pump the propellant from the tanks into the engines, which means that the propellants can be kept under low pressure. This permits the use of low mass propellant tanks, permitting a high mass ratio for the rocket.

Liquid rockets have been built as monopropellant rockets using a single type of propellant, bipropellant rockets using two types of propellant, or more exotic tripropellant rockets using three types of propellant. Bipropellant liquid rockets generally use one liquid fuel and one liquid oxidizer, such as liquid hydrogen or a hydrocarbon fuel such as RP-1, and liquid oxygen. This example also shows that liquid-propellant rockets sometimes use cryogenic rocket engines, where fuel or oxidizer are gases liquefied at very low temperatures.

Tim Ellis is an Australian performer, author and lecturer in the world of magic and illusion.

Ellis began performing magic at the age of 9 after his grandfather gave him a magic set as a gift. At the age of 14 he was the youngest magician ever admitted to The Magic Circle of Victoria and two years later won four out of their five annual awards. In 1980 he won the title 'Best Under 18 Magician of Australia'.

In 1986 he created and produced 'National Magic Week', a ten day festival of the magical arts which was presented annually for the next nine years.

Ellis produced and edited 'Australian Magic Monthly', a national publication for magicians which came out monthly for 100 issues, while writing a regular column on the Australian magic scene for the international Genii.

Ellis created 'MagicSports' a form of improvised magic games based on Keith Johnstone's 'Theatre Sports'.

In 1992 he bought Australia's oldest magic shop, 'Bernard's' which he owned for several years.

In 1994 he was awarded second place in 'Micro Magic' at the FISM World Magic Championship in Yokohama, Japan. This followed the 'Special Prize of the Jury' he was awarded at the 1991 FISM in Lausanne, Switzerland for his 'Six Card Rap'.