Why do some cups keep your coffee hot longer? Explore the physics of thermal conductivity, wall thickness, and glaze composition that determine how your brew maintains temperature.
Have you ever noticed how some cups keep your coffee piping hot while others seem to cool almost immediately? The answer lies in the physics of heat transfer, and understanding these principles helps explain why our cups are designed the way they are.
Thermal Conductivity
Different materials conduct heat at different rates. Ceramic materials, particularly stoneware, have relatively low thermal conductivity. This means heat moves slowly through the material, keeping the coffee hot inside while the exterior remains comfortable to hold. Metals, by contrast, conduct heat rapidly, which is why metal mugs can feel too hot to touch.
Wall Thickness Matters
Thicker walls create more insulation, slowing heat loss through conduction. Our Essential Series features thick walls specifically designed for superior heat retention. However, there's a balance—too thick, and the cup becomes heavy and unwieldy. Too thin, and heat escapes quickly.
Surface Area and Evaporation
A wider opening exposes more liquid surface to air, increasing evaporation and heat loss. Narrower cups reduce surface area, helping maintain temperature. This is why espresso cups are typically small and narrow—they're designed to keep the concentrated brew hot from first sip to last.
Glaze Composition
The glaze layer on a ceramic cup also affects heat retention. A smooth, non-porous glaze reduces heat loss through the surface. Some glazes are specifically formulated to provide additional insulation. The dual-firing process we use creates a dense, impermeable surface that minimizes heat transfer.
The Perfect Balance
Our cups are engineered with these principles in mind. The right combination of material, thickness, and design creates a vessel that maintains optimal temperature while remaining comfortable to use. It's science in service of your daily ritual.