No, you should not put a glass of water inside the microwave oven when heating something. It is generally safe to heat water in the microwave, but there are some important precautions to keep in mind:
Never put an empty glass in the microwave: When you heat an empty glass, it can get superheated and explode due to the absence of any liquid to absorb the microwave energy. Always make sure there is water or another liquid inside the glass before microwaving.
Use microwave-safe containers: Ensure that the glass you use is labeled as microwave-safe. Not all types of glass are suitable for use in the microwave, and using the wrong type could result in breakage or shattering.
Avoid superheating: Even with water in the glass, it's essential to take precautions against superheating. Superheating occurs when the water is heated beyond its boiling point without actually boiling. When you disturb the superheated water, it can suddenly erupt and cause severe burns. To avoid this, you can place a microwave-safe object (like a wooden stick or a microwave-safe tea bag) in the water, which helps prevent superheating by providing nucleation sites for bubbles to form.
Be cautious when removing the glass: After heating the water, use oven mitts or a thick towel to handle the glass as it will become hot.
In summary, it is generally safe to heat a glass of water in the microwave as long as you follow the guidelines mentioned above and take appropriate precautions. However, always refer to the manufacturer's instructions for your microwave oven and containers to ensure safe use. If you have doubts about using a specific glass container in the microwave, it's best to use a microwave-safe alternative.