Which best describes the term derived unit in si? 1.one of the metric base units that is the foundation of si 2.a conversion factor between base units 3.a specific combination of base units with its own name 4.a prefix multiplier for a base unit

A "derived unit" is a specific combination of base units with its own name. (3)

Examples:

Combination of base units                       Its own name

kilogram-meter / second²                                 Newton

Coulomb / second                                             Ampere

kilogram-meter² / second² (Newton-meter)     Joule

kilogram-meter² / second³ (Joule / sec)           Watt

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.