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ערשטע זײַט

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‫בילד פֿון דער טאָג
‫בילד פֿון דער טאָג
Flowering trees at the bottom of the Eiffel Tower in Paris (France). Today is the March equinox, which marks the beginning of astronomical spring in the Northern Hemisphere.
+/− [yi], +/− [en]

Previous pictures of the Day can be found at its project page.

מעדיע פון ​​דעם טאָג
מעדיע פון ​​דעם טאָג
An experiment showing burning of sulfur in oxygen. A flow-chamber joined to gas washing-bottle (filled with solution of methyl orange) is being used. The product is sulfur dioxide (SO2) with some traces of sulfur trioxide (SO3). The 'smoke' that exits the gas-washing bottle is, in fact, a sulfuric acid fog generated in a reaction represented by:
SO3(g) + H2O(l) = H2SO4(aq).
The oxides are acidic, as can be witnessed by the colour change of the indicator.
+/− [yi], +/− [en]

Previous media of the Day can be found at its project page.

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