The Tiny Hole in Your Coffee Cup Lid: More Than Just a Design Feature

• Takeaway coffee cups feature a small hole in the lid, often mistaken as decorative.
• This small hole allows steam to escape, preventing pressure buildup and maintaining drink temperature.
• It also acts as a pressure equalization port, allowing air to enter and prevent a vacuum as you drink.
• The hole ensures a smooth, consistent flow of coffee, preventing spills and uneven sips.
• It's a clever piece of practical engineering for a better on-the-go coffee experience.