Deep frying yields a higher BX (typically 9.5-11) than air frying (6.5-8.5) because oil transfers heat 23x faster than air, creating micro-steam explosions that puff the surface into brittle peaks. To boost air-fryer BX, spray oil directly onto the food midway through cooking.
| Metric | Measures | BX Relationship | | :--- | :--- | :--- | | | Free water available | Inverse correlation (Lower aw = Higher BX) | | Fracturability | Peak force (N) | Positive correlation (Higher force = Higher BX, but only to a point) | | Hardness | Resistance to deformation | Not directly related (Diamond is hard, not crispy) | | Crunchiness | Low-frequency, multi-stage collapse | A subset of the BX scale (BX 4-9 is crunchy; BX 10+ is crispy) |