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Speed of sound in different substances or organs.
| Material | Speed (m/s) |
|---|---|
| Air | 331 |
| Fat | 1450/1465 |
| Water (50 °C) | 1540 |
| Human soft tissue | 1540 |
| Liver | 1549 |
| Kidney | 1561 |
| Blood | 1570/1584 |
| Muscle | 1585 |
| Non-fatty tissue | 1575 |
| Cortical bone | 3635 |
| Amniotic fluid | 1535 |
