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## sound intensity Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...intensity Symbol: L or J A physical quantity, the *sound power (unidirectional) through an area perpendicular to the direction of propagation divided by the area. The *SI unit is the watt per square...

## proper motion Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...motion Symbol: μ (Greek mu) The apparent angular motion of a star, perpendicular to the line of sight, in a year. It is measured in arc seconds per...

## ortho- Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

... ( orth- before vowels) Prefix denoting 1 straight, correct, or upright (e.g. orthostatic, orthostichy, orthotropism). 2 perpendicular or perpendiculars (e.g. orthocentre, orthogonal, orthorhombic). 3 the most highly hydrated form of an oxo acid (e.g. orthophosphoric acid). The use of oxidation numbers is now recommended (e.g. orthophosphoric acid is phosphoric( v ) acid). 4 a diatomic molecule in which both nuclei have parallel spins (e.g. orthodeuterium,...

## surface tension Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...tension Symbol: σ or γ (Greek sigma, gamma) A physical quantity, the *force in the plane of a surface perpendicular to a line element of the surface, divided by the length of the line element. The *SI unit is the newton per metre (N m −1...

## moment of force Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...of force Symbol: M A physical quantity measuring the turning effect produced by a *force . It is a *pseudovector whose magnitude is rF ; F is the magnitude of the force and r the perpendicular distance from the force's line of action to the axis of rotation. Anticlockwise moments are opposite in sign to clockwise moments. The *SI unit is the newton...

## moment of inertia Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...of inertia Symbol: I A scalar physical quantity, the sum Σ mr 2 for all the particles of a body, where m is the mass of a particle and r its perpendicular distance from the axis under consideration. For a homogeneous body the sum is replaced by an integral. The *SI unit is the kilogram metre...

## electric current density Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...current density Symbol: J or j A physical quantity, *electric current divided by the cross-sectional area of the current-carrying medium, the area being perpendicular to the direction of flow. The *SI unit is the ampere per square...

## vector product Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...product A quantity involving two *vectors , a and b . It is denoted a × b (bold multiplication sign). It has a magnitude ab sin θ, where θ is the angle between the vectors a and b , and a direction perpendicular to the plane of a and b . A vector product is not however a true vector: under a space reflection ( a x becomes – a x , b x becomes – b x , etc.) the components of a × b do not change sign. It is therefore often called a *pseudovector . Also called cross product...

## pressure Reference library

### The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

...Symbol: p A physical quantity, the *force acting perpendicular to an element of area, divided by the element of area. The term is best limited to liquids and gases and to solids in uniform isotropic compression. (In general for solids one is concerned with *stress , which is not usually isotropic or uniform.) The *SI unit is the pascal but the bar may also be used for fluid pressure. Use of the atmosphere, millimetre of mercury, and the torr is discouraged; these units should only be used for rough comparisons. The standard pressure for gases...

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