The glass used in making lab apparatus is:

Options

A. Pyrex glass
B. Hard glass
C. Soft glass
D. Security glass

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks about the type of glass used in making laboratory apparatus.

2. **Understand the Options**: The options provided are:
- Pyrex glasses
- Hard glasses
- Soft glasses
- Security glasses

3. **Consider the Requirements for Lab Glassware**: Laboratory apparatus needs to withstand high temperatures, resist chemical reactions, and have low thermal expansion.

4. **Evaluate Each Option**:
- **Pyrex Glasses**: Made from borosilicate, known for its high resistance to thermal shock and chemical attack. It is commonly used in lab equipment like test tubes and beakers.
- **Hard Glasses**: Generally refers to glass that is durable but may not have the specific properties needed for lab use.
- **Soft Glasses**: Typically not used for lab apparatus as they can deform under heat and are more susceptible to chemical reactions.
- **Security Glasses**: Designed for safety and impact resistance, not specifically for laboratory use.

5. **Conclusion**: Based on the properties required for laboratory glassware, Pyrex glasses are the most suitable option due to their high resistance to thermal shock and chemical attack.

6. **Final Answer**: The glass used in making lab apparatus is **Pyrex glasses**.

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