Technician A says the Delta T method of adjusting the charge levels of the refrigerant system relies on a comparison of the inlet and outlet temperatures of the evaporator. Technician B says systems should always be checked first for refrigerant contamination. Who is correct

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?