Question 1

What is specific heat capacity?

Accepted Answer

Specific heat capacity (c) is the amount of energy needed to raise one kilogram of a substance by one degree Celsius. It measures how resistant a material is to temperature change. Water has a very high specific heat (4,186 J/kg·K), meaning it absorbs a lot of energy for each degree of temperature rise. Metals like copper (385 J/kg·K) heat up much more quickly.

Question 2

How is specific heat measured experimentally?

Accepted Answer

Specific heat is typically measured using calorimetry. A known mass of the substance is heated with a known amount of energy, and the resulting temperature change is measured. Using c = Q/(mΔT), the specific heat is calculated. A calorimeter minimizes heat loss to the environment for accurate results.

Question 3

Why do different materials have different specific heats?

Accepted Answer

Specific heat depends on the molecular structure and bonding of a material. Materials with complex molecular structures or strong intermolecular bonds (like hydrogen bonding in water) can absorb more energy in molecular vibrations and rotations before their temperature rises. Metals with simple crystal structures and weakly bonded atoms have lower specific heats.

Question 4

What is the difference between specific heat and heat capacity?

Accepted Answer

Specific heat (c) is heat capacity per unit mass, measured in J/(kg·K). Heat capacity (C) is the total capacity of an object, C = mc, measured in J/K. Specific heat is a material property (same for any amount of that material), while heat capacity depends on both the material and the mass of the object.

Specific Heat Calculator (c = Q/mΔT)

Frequently Asked Questions