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# HKMetadataKeyBarometricPressure

The metadata key for the barometric pressure associated with a sample.

```
let HKMetadataKeyBarometricPressure: String
```

## Discussion

This key takes an [`HKQuantity`](/documentation/HealthKit/HKQuantity) value that measures the barometric pressure in units of pressure, such as [`atmosphere()`](/documentation/HealthKit/HKUnit/atmosphere()), [`pascal()`](/documentation/HealthKit/HKUnit/pascal()), or [`millimeterOfMercury()`](/documentation/HealthKit/HKUnit/millimeterOfMercury()).

---

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