The pop sound you hear is a normal venting phenomenon resulting from internal pressure changes. This sound occurs as the device adjusts to the pressure difference when the lid is opened.
To ensure safety and prevent burns, it is essential to follow proper handling procedures. Before opening the lid and pouring out the water, always press the water dispensing button. This action helps release any built-up pressure and reduces the risk of hot water spillage. By doing so, you can safely manage the water dispensing process and avoid potential accidents or injuries related to sudden pressure changes.