Which of the following terms refers to the temperature at which a given oil will begin to produce visible smoke?

• A. Flash point
• B. Melting point
• C. Boiling point
• D. Smoke point

Answer: (D)

Verified step by step guidance

1. Understand the definitions of each term: The flash point is the lowest temperature at which a liquid can form an ignitable mixture in air near its surface.
2. The melting point is the temperature at which a solid becomes a liquid.
3. The boiling point is the temperature at which a liquid's vapor pressure equals the external pressure, causing it to boil.
4. The smoke point is the temperature at which an oil begins to produce a continuous visible smoke, indicating thermal decomposition.
5. Therefore, the term that refers to the temperature at which a given oil will begin to produce visible smoke is the smoke point.