| Share | Phrase |
|---|
| 22.68% | exposed [physical/chemical] surface |
| 17.16% | exposed [physical/chemical] end |
| 16.30% | exposed [physical/chemical] portion |
| 11.83% | exposed [physical/chemical] area |
| 4.98% | exposed [physical/chemical] face |
| 4.82% | exposed [physical/chemical] part |
| 2.98% | exposed [physical/chemical] opening |
| 2.83% | exposed [physical/chemical] length |
| 2.72% | exposed [physical/chemical] side |
| 1.98% | exposed [physical/chemical] tip |
| 1.97% | exposed [physical/chemical] groove |
| 1.32% | exposed [physical/chemical] shoulder |
| 1.21% | exposed [physical/chemical] wall |
| 1.20% | exposed [physical/chemical] line |
| 1.18% | exposed [physical/chemical] actuator |
| 1.12% | exposed [physical/chemical] electrode |
| 1.03% | exposed [physical/chemical] terminal |
| 0.92% | exposed [physical/chemical] section |
| 0.89% | exposed [physical/chemical] layer |
| 0.80% | exposed [physical/chemical] position |