Gradual color gradient bar of cold and warm

Quick answer：

Gradual color gradient bars are a visual representation that uses a spectrum of colors to transition smoothly from one shade to another. In the context of 'cold and warm,' this would imply a gradient that starts with cooler colors (like blues and greens) and transitions into warmer colors (like oranges and reds). This is often used in design, color theory, and digital media to create a sense of flow or to represent temperature gradients. In digital interfaces, it can be used to indicate temperature or to provide visual feedback.