Data Table Interpolation

Question 1

Why are gas properties calculated and steam properties found in tables?

Answer 1

Because gases are highly superheated and behave predictably due to kinetic energy, allowing for calculations. Steam, however, is often only slightly superheated, and its molecular interactions are complex—requiring data tables.

Question 2

What is the interpolation formula used to estimate values between two data points?

Answer 2

(y - y₁) / (y₂ - y₁) = (x - x₁) / (x₂ - x₁)

Question 3

What does the formula t = Q / P represent?

Answer 3

It represents the time (t) required to transfer a quantity of energy (Q) at a given power level (P).

Question 4

What does h_fg represent in steam tables?

Answer 4

It represents the latent heat of vaporization—the energy needed to convert 1 kg of water at 100°C into 1 kg of steam at 100°C.

Question 5

What extra energy must be accounted for if water starts below 100°C before boiling?

Answer 5

The energy required to raise the temperature of water up to 100°C before it begins to boil.