Give one example of peizoelectric substance.

Explanation

**Step-by-Step Solution:**

1. **Understanding Piezoelectric Substances**:
- Piezoelectric substances are materials that generate an electric charge in response to applied mechanical stress. This property is utilized in various applications, including sensors, actuators, and transducers.

2. **Identifying Examples**:
- There are both natural and synthetic piezoelectric materials. Common examples include quartz (natural) and lead zirconate titanate (synthetic).

...