A Manual of Experiments in Elementary Science: Teacher's Edition (1918)
Curtis, Francis D. · Charles E. Merrill Company · leaf 72
full of gas, keeping the mouth of the jar down, place the jar of gas quickly over the porous cup, directing the attention of the class to the end of the tube in the tumbler. Bubbles will issue from the end of the tube. Explain that the student is to supply the word gas or hydrogen wherever there is… … slowly than the gas molecules came in, that their departure was not sufficient to offset the arrival of gas molecules, hence the increase of pressure in the cup. 4. Less. A partial vacuum or reduced pressure would then have been produced, in the cup, owing to the departure of the gas molecules…
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Internet Archive · National Library of Education · Public domain (published before 1931). Free to use for anything.
