101325 Newton candela per

 101325 Newton candela per square meter in the pressure, the solidification temperature of the blackbody is platinum 1/600000m2 surface in the vertical direction of the light intensity.

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1971, 14th International Conference measured by the pressure units newtons per square meter specifically name "Pascal" symbol Pa. Thus, the definition of candela read:

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101325Pa candela is under pressure in the solidification temperature of the blackbody platinum 1/600000m2 surface in the vertical direction of the light intensity.

This definition has two terms need to explain:

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1. Platinum freezing point: We sense can be understood that a solid melting the liquid, and then the formation of vapor, in the process, although they coexist the temperature is fixed, but they can not be fixed in any state, and in a given solid heating process, the temperature is gradually increased, the melting temperature is just one fixed, and then began to heat up the solid is completely melted, the junction is in their freezing point.