3B Scientific Greenhouse Effect Kit (115 V, 50__60 Hz) - Manual (Page 6)

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6. Experiments
6.1 Measuring the intensity of “solar radiation”
• Place the water-filled cuvette, and the air-filled
absorption chamber behind it, in the incoming
beam.
• Measure the intensity of the transmitted radia-
tion with the thermopile.
• Replace the air-filled absorption chamber with
the one that contains butane, and again meas-
ure the intensity of the transmitted radiation
with the thermopile.
Result of the measurements: the thermopile shows
about the same intensity in both cases. Thus, bu-
tane only has a small effect on the absorption of
solar radiation.
6.2 Measuring the intensity of the long-wave
infrared radiation
• Place the black metal disc, and the air-filled
absorption chamber behind it, in the incoming
beam.
• Wait about two minutes for the black metal disc
to become warm.
• Measure the intensity of the transmitted radia-
tion with the thermopile.
• Replace the air-filled absorption chamber with
the one that contains butane, and again meas-
ure the intensity of the transmitted radiation
with the thermopile.
Result of the measurements: when butane is pre-
sent in the absorption chamber, the thermopile
shows a considerably lower intensity being transmit-
ted than in the case of absorption by air alone.