This mode, when enabled, changes gas particles into air properties. Each gas has it's own effect on the air, like color, spark conducting etc.

Gas effects:

N2 (Nitrogen) - Doesn't effects anything.

H2 (Hydrogen) - Has effect on burning. Turns to SMKE if in the same square as FIRE. Might explode in large amounts.

BOYL (Boyle) - Effects the color of air.

CAUS (Caustic Gas) - Makes the air more acid-like, dissolving anything like CAUS particle.

CO2 - Affects the amount of OXYG plants produce and decreases burning effect.

OXYG - Increases burning effect.

SMKE - Has no effect on anything, but can detonate some explosives.

NBLE - Effects air electrocuting.

PLSM - Detonates all explosives and melts anything that is meltable.

WTRW - Effects PHOT transparency of air.

GAS - Increases burning effect. Can explode.

FIRE - Detonates explosives, burns some things.

All of these gases change the air's color into their own color.

Air pressure is changed too. Positive pressure is now created when there is too much gas in one place. It tends to move into other squares if it is possible. Negative pressure is created when there is lack of gases. Nothing else has effect on pressure.

New tool: RMVG (Remove Gases) 

Type: Walls.

When used, removes gases in some area.

Uses: *there should be a list that is so long, i don't want to publish it here.*