which substance is most likely to heat up the fastest?\no water (specific heat of 4.19 j/g·c°)\no copper…

Explanation:

Step1: Understand specific - heat concept

The lower the specific heat of a substance, the less heat energy is required to raise its temperature by 1°C. So, the substance with the lowest specific - heat will heat up the fastest.

Step2: Compare specific - heat values

We have the specific heat values: water ($4.19\ J/g\cdot^{\circ}C$), copper ($0.39\ J/g\cdot^{\circ}C$), aluminum ($0.90\ J/g\cdot^{\circ}C$), dry air ($1.01\ J/g\cdot^{\circ}C$). Among these values, $0.39\ J/g\cdot^{\circ}C$ (copper) is the lowest.

Answer:

copper (specific heat of $0.39\ J/g\cdot^{\circ}C$)