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Attraction: General term to include anything a visitor might be interested in seeing.

Electrostatic Attraction: The attraction between atoms of opposite charge that holds the atoms together in ionic bonds.

Apsides: The points in the orbit of a planet or moon which are the nearest and farthest from the center of attraction. In the Earth's orbit these are called perihelion and aphelion, and in the Moon's . . . View Full Definition

Tide-Producing Potential: Tendency for particles on the Earth to change their positions as a result of the gravitational interactions between the Sun, Moon, and Earth. Although gravitational attraction varies inverse . . . View Full Definition

Van Der Waals Equation: A semiempirical equation that describes the relationship between pressure (P), volume (V), temperature (T), and moles of gas (n) for a real gas. The equation is (P + n2a/V2)(V - nb) = nrt, w . . . View Full Definition

Lambda (82): Smaller lunar evectional constituent. This constituent, with <2, :2, and (S2), modulates the amplitude and frequency of M2 for the effects of variation in solar attraction of the Moon. This . . . View Full Definition

Enthalpy Of Vaporization: The change in enthalpy when one mole of liquid evaporates to form one mole of gas. Enthalpies of vaporization are always positive because vaporization involves overcoming most of the intermo . . . View Full Definition

Electronegativity: Electronegativity is a measure of the attraction an atom has for bonding electrons. Bonds between atoms with different electronegativities are polar, with the bonding electrons spending more . . . View Full Definition

Enthalpy Of Fusion: The change in enthalpy when one mole of solid melts to form one mole of liquid. Enthalpies of fusion are always positive because melting involves overcoming some of the intermolecular attrac . . . View Full Definition

Enthalpy Of Sublimation: The change in enthalpy when one mole of solid vaporizes to form one mole of gas. Enthalpies of sublimation are always positive because vaporization involves overcoming most of the intermolec . . . View Full Definition