Gases are light elements that have little gravitational attraction, no gravitational attraction, or rise up (like steam).

Oxygen

Color: Light Blue (creates a haze)

Temp: 22.00

Highly combustible gas. Oxygen changes into Liquid Oxygen (LO2) under -180.00 C or under high pressures (>100.00). Oxygen can be produced when SMKE or CO2 is absorbed by PLNT, simulating photosythesis.

FUSION: When OXYG is exposed to high newtonian gravity, maximum possible temperature and pressure, it will fuse into molten BMTL.

Note: In the real world, oxygen can't be ignited, it promotes combustion when in high concentrations. In fact, combustion is just a fast version of oxidation.

Carbon Dioxide

Color: grey

Temp: 22.00

A heavy gas (as far as gasses go), slowly drifts downwards. Turns water into carbonated water. Forms Dry Ice at around -90 degrees. Puts out fire. Is converted to OXYG when it comes in contact with PLNT, simulationg photosynthesis.

FUSION: When CO2 is at 200 pressure and heated to 9,500 degrees, it will ignite in a large explosion, turning into PLSM and creating a shockwave of the maximum possible temperature and pressure in TPT. It will also release 1 NEUT, Several photons, 1 ELEC, and a bunch of OXYG.

Smoke

Color: grey (hazy effect)

Temp: 342.00

Smoke appears after "cold" combustion, when fire is cooled to a low temperature. Heats elements it comes into contact with and generates slight pressure. SMKE can be converted into oxygen when it comes into contact with PLNT

Noble Gas

Color: orange

Temp: 24.00

Ionizes into plasma if sparked ,the plasma is only around 1600 degrees celcius, but with each further spark, the plasma produced gets increasingly hotter. Infinite life. Noble Gas produces a slight pressure until the current ambient pressure is around 3.5. Now the second stage in the nuclear fusion process.

FUSION:When NBLE is at 100 pressure and heated to 5,000 degrees, it will transform into PLSM and will also release 1 NEUT, 1 PHOT(colored red), and 1 particle of CO2. It will also generate 50 pressure and raise the surrounding temperature to 9,000 degrees.

Plasma

Color: Light Purple (glows)

Temp: 10000.00

Extremely hot gas, burns at 10,000 degrees celcius. Plasma can be produced when FIRE is heated to temperatures around 2500 degrees, from sparking Noble Gas [NBLE] (but at a lower temperature of 1000 degrees), or sparking 2 parallel electrodes [ETRD], causing plasma arcs. Plasma has similar properties to fire.

Water vapor

Color: very light blue (produces a hazy effect)

Temp: 122

Water vapour. Produced when water is heated above 100C (Salt Water must be heated further to around 200 degrees). When Water is boiled in high volumes, quickly, the steam can create very high pressure. When pressurised or cooled, it condenses to DSTW.

If Steam is sublimated (gas >> solid without going through the liquid phase) it forms Rime, which is another form of Ice in The Powder Toy. When Rime is sparked with electricity, it becomes Fog.

Acid in contact with steam will turn the steam into caustic gas.

Gas

Color: yellow

Temp: 24.00

Combustible gas. Can be produced by:

Bombarding OIL with Neutrons. Bombarding DESL with Neutrons. Heating OIL. Placing OIL in low pressure.

High pressure will form Oil, how ever it will not stay like this unless the pressure is kept.

Boyle

Color: dark green

Temp: 24.00

Variable pressure gas. Heat to expand, cool to contract. non-flammable. Has Hydrogen effects. Makes FOG when mixed with WATR or OXYG. When placed in a container with URAN will undergo a reaction in which the BOYL expands, creating pressure, causing URAN to heat up, causing BOYL to create pressure, etc.

Hydrogen

Color: Light blue (creates a haze)

Temp: 22.00

Hydrogen has the same effects as O2 but when it meets O2 and is set alight with FIRE it burns into Water vapor. Hydrogen also has no effect on pressure and can touch QRTZ at sub-zero temperatures.

Added "fusion" (v 73.0). Fusion idea and process suggested by BoredInSchool and coded by jacob1.

FUSION: When HYGN is at 50 pressure and heated to 2,000 degrees, It will transform into PLSM and will release 1 NEUT, 1 PHOT(colored yellow), and generate either 1 or 2(random) particles of NBLE. It will also generate 50 pressure and raise the surrounding temperature to 4,000 degrees. NOTE: Neutron+Electron=Hydrogen, which means the process might self perpetuate(extremely rare).

Caustic Gas

Color: Light green

Temp: 22.00

Caustic gas, acts like acid. Added in version 63 beta. It will eat almost all the particles. Creates heat when destroying particles. It doesn't trigger explosives except if the heat created by the reaction activates or ignites said explosive. Acid in contact with steam will turn the steam into caustic gas.