"large enough" and "bath" is doing a lot of work here. I don't think it's necessarily about size. It's about that size and configuration implying the particle s

"large enough" and "bath" is doing a lot of work here. I don't think it's necessarily about size. It's about that size and configuration implying the particle states are difficult to know. If for example, you had a large size but the states were knowable because they were all correlated, they were following a functionally predictable path, for example all moving away from the ice cube, or all orderly orbiting around the ice cube in a centrifuge such that they didn't quite touch the ice cube, it wouldn't melt.