Over the course of millions of years, these protostars settle down into a state of equilibrium, becoming what is known as a main-sequence star. Nuclear fusion powers a star for most of its life. Initially the energy is generated by the fusion of hydrogen atoms at the core of the main-sequence star. Later, as the preponderance of atoms at the core becomes helium, stars like the Sun begin to fuse hydrogen along a spherical shell surrounding the core.
Rambutan is a tropical fruit whose scientific term is Nephelium Laapaceum. Rambutan is believed to have originated in Indonesia and is now widely found in Philippines, Malaysia, Cambodia, Thailand, Sri Lanka, India, Ecuador, Australia and America. In India, Rambutan fruit is available mostly in the southern states of Tamil Nadu, Kerala and Karnataka.
Isobutane (i-butane), also known as methylpropane, is a chemical compound with molecular formula C. 4H. 10 and is an isomer of butane. It is the simplest alkane with a tertiary carbon. Concerns with depletion of the ozone layer by freon gases have led to increased use of isobutane as a gas for refrigeration systems, especially in domestic refrigerators and freezers, and as a propellant in aerosol sprays. When used as a refrigerant or a propellant, isobutane is also known as R-600a. Some portable camp stoves use a mixture of isobutane with propane, usually 80:20. Isobutane is used as a feedstock in the petrochemical industry, for example in the synthesis of isooctane.