An air breathing air craft is flying at an altitude where

An air breathing air craft is flying at an altitude where the air density is half the value at ground level. With reference to the ground level, the air- fuel ratio at this altitude will be

A / F ratio =	m_a
	m_f

where m_a – mass of air, m_f – mass of fuel

	( A / F ratio )_ground	=	( m_a )_ground
	( A / F ratio )_altitude		( m_a )_altitude

as m_f is same at both places .

	( m_a )_ground	=	V × ρ_ground
	( m_a )_altitude		V × ρ_altitude

where 'V' is the volume of air taken in.

=	1	= 2
	(1 / 2)