Imagine you're playing a game of "spot the difference" between two pictures, except instead of pictures, we're looking at temperatures. The minimum resolvable temperature difference is the smallest difference in temperature between two things that you can see or measure.
Let's say you have a super cool heat-sensing camera, and you're using it to look at two objects. Object A is warm and object B is cool. Now, you want to figure out the temperature difference between the two objects.
The minimum resolvable temperature difference is basically the smallest amount that your camera can detect as different between object A and object B. If the temperature difference between the two things is very small, your camera might not be able to tell the difference at all!
So, the minimum resolvable temperature difference depends on how sensitive your camera or temperature sensor is. If it's really sensitive, it might be able to detect tiny temperature differences (like a fraction of a degree!), but if it's not that sensitive, it might need a bigger temperature difference before it can tell the two objects apart.
Overall, the minimum resolvable temperature difference is an important factor in measuring temperatures accurately, and it's something that scientists and engineers pay a lot of attention to when designing tools and instruments for measuring heat.