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# Factorio Prototype Docs Version 2.0.7

## Weight :: double

Weight of an object. The weight is stored as a fixed-size 64 bit integer, with 16 bits reserved for decimal precision, meaning the smallest value step is `1/2^16`.

Type used in

- ItemPrototype::weight
- SpacePlatformHubPrototype::weight
- TilePrototype::weight
- UtilityConstants::default_item_weight
- UtilityConstants::rocket_lift_weight