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What will happen to thrust and specific impulse as the rocket is propelled to higher altitudes?

What will happen to thrust and specific impulse as the rocket is propelled to higher altitudes? Correct Answer Thrust increases, specific impulse increases

Atmospheric pressure decreases with increasing altitude. So the pressure thrust part of the total thrust increases and hence the total thrust increases. Specific impulse is impulse per unit weight of the propellant and proportional to thrust, so it too will increase.

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