Here's why:

* Temperature is a measure of the average kinetic energy of the particles within a substance. This means it reflects how much the particles are moving and vibrating.

* Mass is a measure of the amount of matter in an object.

* While a larger mass generally means more particles, it doesn't automatically mean higher temperature.

Here's a better way to think about it:

* A larger mass can hold more thermal energy. This means it takes more energy to raise the temperature of a larger mass compared to a smaller mass. Think about a large pot of water vs. a small cup – it takes longer to boil the pot of water.

* Two objects with the same mass can have different temperatures. A small, hot object can have a higher temperature than a large, cold object.

Here's an analogy: Imagine a crowd of people dancing.

* Temperature: How vigorously they're dancing (average kinetic energy).

* Mass: The number of people in the crowd.

A larger crowd might have more total energy, but they might not be dancing as vigorously as a smaller, more energetic group.

In conclusion: Mass and temperature are related, but not directly proportional. More mass means more capacity for thermal energy, but not necessarily a higher temperature.