Простой метод оценки изоляционного эффекта термоса
Quickly check the shell Fill it with boiling water, cover tightly, and let it sit for 3-5 минуты. The outside of the cup is cool,vacuum is not an issue. The cup is hot on the outside,It is leaking and not keeping the temperature, so it needs to be replaced. Measure water temperature (room temperature 25℃) […]
