It is generally safe to touch the outside of a microwave oven while it's running or shortly after it has been turned off. Microwave ovens are designed with insulation and protective layers to prevent excessive heat from transferring to the outer surfaces. However, there are a few considerations to keep in mind:
Heat transfer: While the exterior of a microwave oven should not become excessively hot, some heat may still be transferred to the outer surfaces during operation. If you touch the exterior and it feels warm, it is advisable to use caution and avoid prolonged contact.
Intensity of use: If a microwave oven has been used for an extended period or for cooking high-heat foods, the exterior may become hotter than usual. In such cases, it's best to exercise caution and allow the oven to cool down before touching it.
Malfunction or damage: If a microwave oven is malfunctioning or has suffered damage, there is a potential risk of heat escaping and causing the exterior surfaces to become hotter than normal. If you suspect any issues with your microwave oven, it is best to have it inspected or repaired by a qualified professional.
To ensure safety, it's always a good practice to follow the manufacturer's instructions and guidelines provided with your specific microwave oven model. If you have concerns about the temperature of the exterior, it's best to err on the side of caution and avoid touching it until it has had sufficient time to cool down.