It is not safe to put dry ice inside a microwave. Dry ice is solid carbon dioxide, and when it is exposed to high heat, it undergoes sublimation, transforming directly from a solid to a gas. Placing dry ice in a microwave can lead to a buildup of pressure as the gas expands, potentially causing the container to burst or explode. This can result in damage to the microwave, personal injury, or other safety hazards.
If you have used dry ice and there is residual vapor remaining in the microwave, it is crucial to allow sufficient time for it to dissipate before using the microwave again. The exact time required to eliminate the dry ice vapor will depend on several factors, such as the amount of dry ice used, the size of the microwave, and the ventilation in the area. It is best to err on the side of caution and wait until the area is well-ventilated and free from any lingering dry ice vapor before using the microwave.
To ensure safety, it is advisable to use dry ice only in well-ventilated areas and follow proper handling and disposal guidelines provided by the manufacturer or a professional.