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Thâu-ia̍h

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chhiat-oāⁿ     Thâu-ia̍h (Pe̍h-oē-jī)     —      頭頁 (漢字)     切換

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今仔日的圖相

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.
 

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今仔日的影片
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.
 

+/− (nan), +/− (en)

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