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INSAT-1A was an Indian communications satellite which formed part of the Indian National Satellite System. Launched in 1982.

The satellite was de-activated on September 6, 1982 due to propellant depletion.

The greenhouse effect refers to the retention of heat in the atmosphere by greenhouse gases, including water vapor, carbon dioxide, methane and nitrous oxide. Due to increasing levels of greenhouse gases in the atmosphere, partially as a result of human industrial activity, progressively more heat is being trapped, resulting in a phenomenon commonly referred to as global warming. Specifically, global warming refers to the rise in average global surface and ocean temperatures.

Liquid mercury has a density of 13.6 kg per litre; therefore, its specific gravity is 13.6. The gas carbon dioxide, which has a density of 1.976 grams per litre under standard conditions, has a specific gravity of 1.53 (= 1.976/1.29). Because it is the ratio of two quantities that have the same dimensions (mass per unit volume), specific gravity has no dimension.

Gamma radiation and x rays are electromagnetic radiation like visible light, radiowaves, and ultraviolet light. These electromagnetic radiations differ only in the amount of energy they have. Gamma rays and x rays are the most energetic of these.

A radio band is a specific radio frequency and amount of bandwidth required by a transmission centred around that frequency in order to accomplish communication. The type of communication determines how much bandwidth is required and therefore the size of the band.

Tritium is a radioactive isotope of the element hydrogen. Tritium is radioactive and has a half-life of about 12.5 years, which means that half of the radioactive atoms will decay naturally in that time.

In a fast reactor there is no moderator, only fuel and coolant. The moderation of neutrons is undesirable in fast reactors. Commonly used moderators include regular (light) water (roughly 75% of the world’s reactors), solid graphite (20% of reactors) and heavy water (5% of reactors).

The Brayton cycle is a thermodynamic cycle named after George Brayton that describes the workings of a constant-pressure heat engine. The original Brayton engines used a piston compressor and piston expander, but more modern gas turbine engines and airbreathing jet engines also follow the Brayton cycle.

He was one of the Mercury Seven, military test pilots selected in 1959 by NASA as the nation’s first astronauts. On February 20, 1962, Glenn flew the Friendship 7 mission, becoming the first American to orbit the Earth, and the fifth person and third American in space.

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