Calorimetry (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Calorimetry

The science of photometry was then developed to measure by comparison with an accepted standard the amount of light obtain able from a given quantity of the gas tested.

Later, gas being found useful for heating and cooking and for numerous industrial purposes, its thermal or heat producing quality became important. With the introduction of incandescent mantles for gas lighting, the heating value began to assume greater im portance than the illuminating power and as, at present, 80% to 90% of the gas sold is used for its heat, the fairest test of its value to the majority of consumers is the determination of its heating quality.

This cannot be deduced from the results of photometric tests as there is no definite relationship between the light and the heat giving qualities, it being possible to change the composition of the gas materially, substituting one non-illuminant of high heating value {or another giving much less heat without causing any decided change in the candle power. Therefore, the heat producing or calorific value must be sought by other means.

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