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radioactivity (decays per unit time)
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reactance
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resistivity
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snap
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solid angle
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spatial frequency
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specific angular momentum
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specific energy
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specific entropy
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specific heat capacity
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specific volume
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spectral intensity
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spectral irradiance
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spectral power
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spectral radiance
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speed
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stiffness
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stress
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surface tension
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temperature gradient
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temperature relative to 273.15 K
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thermal conductivity
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thermal diffusivity
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thermal expansion coefficient
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thermal resistance
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