# Type Alias: Composition

[**lifecycle-kit**](https://jonbogaty.com/lifecycle-kit/api/readme/index.md)

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[lifecycle-kit](https://jonbogaty.com/lifecycle-kit/api/readme/index.md) / [chem](https://jonbogaty.com/lifecycle-kit/api/chem/readme/index.md) / Composition


# Type Alias: Composition {#type-alias-composition}


> **Composition** = `Record`\<[`BiomoleculeId`](https://jonbogaty.com/lifecycle-kit/api/chem/type-aliases/biomoleculeid/index.md), `number`\>

Defined in: [chem/biomolecules.ts:95](https://github.com/jbcom/lifecycle-kit/blob/074e4e7b8038d3e2de9eb44c4b5b5aee0ef02b48/src/chem/biomolecules.ts#L95)

A body's makeup, as fractions summing to roughly 1.