Which of the correct formula for calculating equivalent evaporation?

1.	Which of the correct formula for calculating equivalent evaporation?
A.	m<sub>e</sub>= ( frac{m_a (h-h_{f1})}{2257} )
B.	m<sub>e</sub>= ( frac{m_a (h-h_{f1})}{1257} )
C.	m<sub>e</sub>= ( frac{m_a (h_{f1}-h)}{2257} )
D.	m<sub>e</sub>= ( frac{(h-h_{f1})}{2257} )
Answer» B. m<sub>e</sub>= ( frac{m_a (h-h_{f1})}{1257} )

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Which of the correct formula for calculating equivalent evaporation?

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