A container of water heated to a given temperature, used for heating substances placed in smaller containers

• A. Erlenmeyer Flask
• B. Water Bath
• C. DNA Isolation
• D. Graduated Cylinder

Answer: (B)

The idea is to provide controlled, uniform heating for small vessels by surrounding them with a bath of water held at a specific temperature. A water bath keeps the temperature consistent and transfers heat evenly to the containers placed inside, preventing hot spots and allowing gentle, precise incubation or warming of samples. This makes it ideal for reactions or procedures that require a steady temperature. An Erlenmeyer flask is simply a container that can be heated, but it doesn’t offer the same controlled, even heating for multiple small samples. A DNA isolation is a procedure, not equipment, and a graduated cylinder is used to measure volume, not heat. So the setup described—water heated to a set temperature with samples placed in it—fits a water bath.