user: Question: What is the SFC when the specific impulse is 453?
Columns: ['Engine type', 'Scenario', 'SFC in lb/(lbf·h)', 'SFC in g/(kN·s)', 'Specific impulse (s)', 'Effective exhaust velocity (m/s)']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['NK-33 rocket engine', 'Vacuum', '10.9', '309', 331.0, 3240.0]
SQL:

assistant: SELECT "SFC in g/(kN·s)" FROM "Table" WHERE "Specific impulse (s)" = 453.0;