Intensive vs. Extensive Properties: Key Differences Explained
Intensive properties—like temperature, color, density—stay the same no matter how much stuff you have. Extensive properties—mass, volume, energy—scale with the amount of substance.
We mix them up because both names sound “size-related.” You’ll see a chef say, “This soup is 90 °C” (intensive) then “We need 3 liters” (extensive) in the same breath, never realizing they flipped categories.
Key Differences
Intensive = intrinsic quality, unchanged by quantity. Extensive = additive; double the material, double the value. Quick check: if dividing the sample changes the number, it’s extensive.
Examples and Daily Life
Gold’s density is 19.3 g/cm³ whether it’s a ring or a brick—that’s intensive. The ring’s 6 g mass versus the brick’s 600 g—that’s extensive. Chem labs use this split to predict reactions without weighing everything.
Is pressure intensive or extensive?
Intensive. Two identical balloons still have the same internal pressure even if one holds twice the gas.
Can a property switch categories?
No. A characteristic is defined by its dependence on amount; it doesn’t morph between types.