“pitch”的概念、定义、翻译、参考文献-科学参考

pitch

Physics

1. (in physics) The property of a sound that characterizes its highness or lowness to an observer. It is related to, but not identical with, frequency. Below about 1000 Hz the pitch is slightly higher than the frequency and above 1000 the position is reversed. The loudness of a sound also affects the pitch. Up to 1000 Hz an increase in loudness causes a decrease in pitch. From about 1000 to 3000 Hz the pitch is independent of loudness, while above 3000 Hz an increase in loudness seems to cause a raising of pitch. Pitch is usually measured in mels; a note of 1000 Hz frequency with a loudness of 40 decibels above the absolute threshold of hearing has a pitch of 1000 mels.

2. (in mechanics) See screw.

Space Exploration

The upwards or downwards motion, relative to the body of the craft, of the nose of a spacecraft or rocket.

Chemistry

A black or dark-brown residue resulting from the distillation of coal tar, wood tar, or petroleum (bitumen). The term is also sometimes used for the naturally occurring petroleum residue (asphalt). Pitch is used as a binding agent (e.g. in road tars), for waterproofing (e.g. in roofing felts), and as a fuel.

Chemical Engineering

1. The distance between the centre-line of tubes used to carry fluids for heat transfer in a shell-and-tube heat exchanger. Square and triangular pitches are commonly used (see Fig. 40).
Fig. 40

2. A generic term used for a flammable semi-solid tar-like substance produced naturally or by the distillation of heavy or long-chained hydrocarbons. It is also known as bitumen or asphalt and used to surface roads.

Electronics and Electrical Engineering

The perceived position of a sound on a scale from low to high. Pitch varies primarily as the fundamental frequency of a sound is altered, but it can also vary to a much lesser extent when, for example, the intensity, spectral content, or duration is changed.

Geology and Earth Sciences

The angle made by a lineation with the strike of the surface on which it occurs.

单词	pitch
释义	pitch Physics 1. (in physics) The property of a sound that characterizes its highness or lowness to an observer. It is related to, but not identical with, frequency. Below about 1000 Hz the pitch is slightly higher than the frequency and above 1000 the position is reversed. The loudness of a sound also affects the pitch. Up to 1000 Hz an increase in loudness causes a decrease in pitch. From about 1000 to 3000 Hz the pitch is independent of loudness, while above 3000 Hz an increase in loudness seems to cause a raising of pitch. Pitch is usually measured in mels; a note of 1000 Hz frequency with a loudness of 40 decibels above the absolute threshold of hearing has a pitch of 1000 mels. 2. (in mechanics) See screw. Space Exploration The upwards or downwards motion, relative to the body of the craft, of the nose of a spacecraft or rocket. Chemistry A black or dark-brown residue resulting from the distillation of coal tar, wood tar, or petroleum (bitumen). The term is also sometimes used for the naturally occurring petroleum residue (asphalt). Pitch is used as a binding agent (e.g. in road tars), for waterproofing (e.g. in roofing felts), and as a fuel. Chemical Engineering 1. The distance between the centre-line of tubes used to carry fluids for heat transfer in a shell-and-tube heat exchanger. Square and triangular pitches are commonly used (see Fig. 40). Fig. 40 2. A generic term used for a flammable semi-solid tar-like substance produced naturally or by the distillation of heavy or long-chained hydrocarbons. It is also known as bitumen or asphalt and used to surface roads. Electronics and Electrical Engineering The perceived position of a sound on a scale from low to high. Pitch varies primarily as the fundamental frequency of a sound is altered, but it can also vary to a much lesser extent when, for example, the intensity, spectral content, or duration is changed. Geology and Earth Sciences The angle made by a lineation with the strike of the surface on which it occurs.
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