What does the big 2 in 2CO2 mean?

A number that comes before a compound or molecule e.g 2 in this case is indicating that there are 2 carbon dioxide molecules. Therefore 2CO2 contains: 2×1=2 Carbon atoms.There are four oxygen atoms in the formula 2CO2. The number 2 that is sub-scripted with O determines the number of oxygen atoms, while the number 2 is showing the carbon dioxide atom means how many carbon dioxide is present.

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In meteorology, a  cloud  is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body. nephology is the science of  clouds, which is undertaken in the  cloud  physics branch of meteorology.cirrus clouds  usually describe clouds high in the atmosphere that can include wispy clouds, typically with ice crystals. variations include cirrus, cirrocumulus and cirrostratus as defined by the cloud's position in the atmosphere.layered stratus clouds  have both flat tops and bases, and can appear as if they take up the whole sky, stretching from horizon to horizon. other combinations and variations include stratus, stratocumulus, nimbostratus and altostratus.cumulus clouds  often pile up in multiple layers of the atmosphere, representing clouds that develop vertically. cumulus clouds often look like pillars with anvil-type tops or columns of clouds stacked vertically. variations include cumulus, cumulus-congestus, cumulonimbus and altocumulus.