Convector heaters and air balloons are featured today when Gerd Sommerhoff explains the simple scientific principle on which they both depend.
For Schools
First shown in Nov. 1961
(to 10.25)
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Convector heaters and air balloons are featured today when Gerd Sommerhoff explains the simple scientific principle on which they both depend.
For Schools
First shown in Nov. 1961
(to 10.25)