Why does synthesis gas (water gas) consist of?

he reason for the two names is down to the method of manufacture. The older name, water gas, is used due to the method of passing steam over hot coke. The name "synthesis gas" came about due to process of synthetic steam reforming of natural gas (methane decomposition in steam under catalysis).

Explanation:

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"Synthesis gas (syngas) A gas mixture that contains varying amounts of carbon monoxide (CO) and hydrogen (H2) generated by the gasification of a carbon-containing material to a gaseous product with a heating value (but less than half the energy density of natural gas)."

Explanation:

14 days is the half-life of phosphorus-32