code/modules/materials/_materials.dm 
| /var/materials_by_gas_symbol | A lookup table of material decls by their gas symbol, used for selection in atmos filters. |
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| /proc/get_descriptive_temperature_strings | Returns a list of strings explaining certain material transitions that can happen at the given temperature, e.g. 'ignite paper', 'melt lead', 'boil water' and so on. |