Liquid

This article has not been revised for the current version (***U50-583005***). It was last updated for *U40-494396*. It may contain inaccuracies.
This article has not been revised for the current version (***U50-583005***). It was last updated for *U40-494396*. It may contain inaccuracies.
**Liquid** is a state of elements.

## Mechanics

* A Liquid is any matter in game that is not a solid entity or gas entity. Almost any material in the game will melt given a high enough temperature.
* Liquids are affected by gravity and can flow across level floors, through open doors and down ladders.
* A Duplicant who finds themselves submerged with no way to rise above the level of the liquid will either drown after a set period without air or will burn to death in hot liquids.
* Liquids do not mix in tiles. Polluted water in water does not cause the clean water to become polluted, although germs may spread.
* Elements with a lower density tends to rise above others. Mixed Liquids with different density and in sufficient amounts will form several layers after a period of time.

* Liquids exposed to space will be destroyed, unless protected by Drywall.
* Liquids can occupy two vertical tiles and touch the solid tile third above. Thus it is possible to make Liquid Airlock.
* Liquids evaporate at 3 degrees above the specified vaporization point, and freeze at 3 degrees below the specified freezing point.
	+ If such transformation happens inside a Liquid Pipe, the pipe will be damaged.
	+ Phase change will not occur if the content of the pipe is 1kg or less.
	+ If a liquid is atop any tile with a temperature exceeding a phase change temperature, it will under go a phase change. This includes tiles with virtually zero Thermal Conductivity, such as Abyssalite.
* All liquids have a certain max mass per tile; above this limit, the liquid will "flow" to the tile above it (provided it's not a solid tile), pushing away the air in the tile. If several such liquid tiles are "stacked" atop each other, pressure will build in the bottom tiles, adding approximately 1% of the above mass to each tile. This pressure can eventually cause damage to surrounding solid tiles.
* Liquids cannot exist in amounts smaller than 10g, unless if it's in pipes.

## Pressure Damage

Liquid tiles which accumulate too much mass (such as from depth stacking) will begin to visually crack the tiles containing them before causing pressure damage to the tile and seep through as droplets until either the tile breaks entirely (losing all materials used to construct it and allowing the liquid to flow out), the pressure is released, or the tile is reinforced with more tiles. The mass at which a tile begins to take pressure damage is dependent upon the liquid's mass per tile(that is, the maximum amount of liquid that can be put in a tile without it overflowing), the tile's strength, the type of tile, and the thickness of the wall. Walls 3 tiles or thicker are immune to pressure damage entirely if there are no pipes running through them. In addition, certain tiles are immune to pressure damage under any circumstances. Some pressure-immune tiles and buildings are airflow tiles, manual airlocks, mechanized airlocks, bunker doors, and solar panels.

The maximum pressure a liquid tile can be at before damaging its tank walls can be calculated using the following formula:

> *max pressure = (liquid MPT) \* (1 + t \* s \* k),*
>
>

where *t* is the thickness of the wall (either 1 or 2), *s* is the strength of the material (located in the *solid.yaml* file) making up the wall, and k is the "strength multiplier", found in the table below. It should be noted that while these formulas *should* give the maximum pressure a wall can withstand before taking damage, in some cases there appears to be a rounding error of less than 1kg. Therefore, it is best to ensure the tank will be dealing with pressures less than the maximum pressure, both to avoid potential rounding errors and as a matter of general caution.

In general, higher strength multipliers correspond to more pressure-resistant tiles. Of course, the base material strength also plays an important role in the maximum pressure a tile can withstand.
Again, note that some pressures may be off by up to 0.1kg due to rounding, so exercise caution when approaching these limits.

## List of Liquids

Ordered by density, from lightest to heaviest.