Here's why it's important to be specific:
* Diameter: The distance across a sphere, passing through its center.
* Size: Can refer to volume, surface area, or even mass.
To give you a better idea of Jupiter's size:
* Volume: 1,321 times the volume of Earth
* Surface Area: 121.9 times the surface area of Earth
* Mass: 317.8 times the mass of Earth
Let me know if you have other questions about Jupiter!