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2. Air changes per hour - Wikipedia

   en.wikipedia.org/wiki/Air_changes_per_hour

   Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each hour.

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   In the lower middle is the capacitor. Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality.

4. Ventilation (architecture) - Wikipedia

   en.wikipedia.org/wiki/Ventilation_(architecture)

   Ventilation (architecture) An ab anbar (water reservoir) with double domes and windcatchers (openings near the top of the towers) in the central desert city of Naeen, Iran. Windcatchers are a form of natural ventilation. [1] Ventilation is the intentional introduction of outdoor air into a space. Ventilation is mainly used to control indoor air ...

5. Living and dying in America’s hottest big city: One week in ...

   www.aol.com/living-dying-america-hottest-big...

   Over the past 100 years, the average July temperature in Phoenix has risen dramatically. In the 1920s, it ranged from 89.3 to 92.7 degrees; in the past decade, it sat between 94.7 and 102.7 degrees.

6. Window - Wikipedia

   en.wikipedia.org/wiki/Window

   A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]

7. Weighing scale - Wikipedia

   en.wikipedia.org/wiki/Weighing_scale

   A scale or balance is a device used to measure weight or mass. These are also known as mass scales, weight scales, mass balances, massometers, and weight balances. The traditional scale consists of two plates or bowls suspended at equal distances from a fulcrum. One plate holds an object of unknown mass (or weight), while objects of known mass ...