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1Internal ballistics — Internal ballistics, a subfield of ballistics, is the study of a projectile s behavior from the time its propellant s igniter is initiated until it exits the gun barrel. The study of internal ballistics is important to designers and users of… …
2Internal drive propulsion — is a form of marine propulsion commonly used in recreational boating. Like other forms of motorized boating, internal drive propulsion employs a motor that turns a propeller to move the boat forward. The primary difference between internal drive… …
3Internal conversion (chemistry) — Internal conversion is a transition in from a higher to a lower electronic state in a molecule. It is sometimes called radiationless de excitation , because no photons are emitted. It differs from intersystem crossing in that, while both are… …
4Internal resistance to South African apartheid — Internal resistance to the apartheid system in South Africa came from several sectors of society and saw the creation of organisations dedicated variously to peaceful protests, passive resistance and armed insurrection. ANC and the PACAlthough… …
5Internal resorption — is an unusual condition of a tooth when the dentin and pulpal walls begin to resorb centrally within the root canal. The first evidence of the lesion may be the appearance of a pink hued area on the crown of the tooth; this condition is referred… …
6Internal combustion engine — The internal combustion engine is an engine in which the combustion of a fuel (normally a fossil fuel) occurs with an oxidizer (usually air) in a combustion chamber. In an internal combustion engine, the expansion of the high temperature and high …
7Internal energy — In thermodynamics, the internal energy of a thermodynamic system, or a body with well defined boundaries, denoted by U , or sometimes E , is the total of the kinetic energy due to the motion of molecules (translational, rotational, vibrational)… …
8Internal ribosome entry site — An internal ribosome entry site, abbreviated IRES, is a nucleotide sequence that allows for translation initiation in the middle of a messenger RNA (mRNA) sequence as part of the greater process of protein synthesis. Usually, in eukaryotes,… …
9Internal Revenue Code — The Internal Revenue Code (or IRC; more formally, the Internal Revenue Code of 1986, as amended) is the main body of domestic statutory tax law of the United States organized topically, including laws covering the income tax (see Income tax in… …
10Internal Macedonian Revolutionary Organization — [ 250px|right|thumb|Excerpt from the statute of BMARC, 1896 (in Bulgarian)Statute of the Bulgarian Macedonian Adrianople Revolutionary CommitteesChapter I. Goal Art. 1. The goal of BMARC is to secure full political autonomy for the Macedonia and… …
