Ch. 27 quiz

Air has weight, volume, and

all of the above. temperature, specific heat, heat conductivity

An anemometer using incoming air to deflect a vane at different angles to calculate velocity is a

Swinging Vane Anemometer

Most people are comfortable in an atmosphere with the relative humidity between temperature between 70°F (21°C) and 85°F (29°C). and the

30% and 70%

the In the summertime, air-conditioned buildings are usually kept at temperatures approximately outside temperature.

10°F (5.6°C) to 15°F (8.4°C) below

makes up 0.03% to 0.04% of the atmosphere and is absorbed by growing plants.

Carbon dioxide

How warm the combination of humidity and temperature feels to an occupant of a space is temperature

Equivalent Temperature

What forecast term on the Beaufort scale is used to describe wind effects of breaking twigs off trees and generally impeding progress?

Gale

A Pitot tube and manometer used for ductwork airflow in HVAC most often measure values in

Inches of water column

The conditions in the atmosphere refer to

Weather

Changing the air in a building is done by ventilation, metered in CFM and referred to as

air changes per hour

According to ASHRAE, the process of treating air so as to control simultaneously temperature, humidity, cleanliness, and distribution is called

air conditioning

Make-up air is necessary for fuel-burning appliances because oxygen is necessary for

combustion

The volume of air flowing through a duct is calculated in

cubic feet per minute

of the air. dividing the weight of air by the volume it occupies, you can calculate the

density

Starting at sea level and rising higher in altitude through the troposphere, atmospheric pressure

drops

gas that is very light and present in most fuels is

hydrogen

Desiccants are substances that absorb from the air.

moisture

The amount of moisture in an dir sample compared to the total amount of moisture the same sample would hold if it were completely saturated at the same temperature defines the term

relative humidity

In the warm season, humidity controls are typically set to the conditioned air.

remove humidity from

When radiant heat strikes a surface that is colder than the radiating body,

some of the radiant heat is absorbed into the colder surface