Primarily organic matter, dark in color, and organic odor Notes: 1. Classification Procedure: First decide which of the three main categories (granular materials, silt-clay materials, or highly organic) the soil belongs. Then proceed from the top to the bottom of the chart and the first group that meets the particle size and Atterberg limits criteria is the correct classification. 2. Group Index  (F
35)[0.2  0.005(LL
40)]  0.01(F
15)(PI
10), where F  percent passing No. 200 sieve, LL  liquid limit, and PI  plasticity index. Report group index to nearest whole number. For negative group index, report as zero. When working with A-2-6 and A-2-7 subgroups, use only the PI portion of the group index equation. 3. Atterberg limits are performed on soil passing the No. 40 sieve. LL  liquid limit, PL  plastic limit, and PI  plasticity index. 4. AASHTO definitions of particle sizes are as follows: (a) boulders: above 75 mm, (b) gravel: 75 mm to No. 10 sieve, (c) coarse sand: No. 10 to No. 40 sieve, (d) fine sand: No. 40 to No. 200 sieve, and (e) silt-clay size particles: material passing No. 200 sieve. 5. Example: An example of an AASHTO classification for a clay is A-7-6 (30), or Group A-7, subgroup 6, group

Subcooling. Cooling at constant pressure of a refrigerant liquid to below its condensing temperature. Suction Line. The low-temperature, low-pressure refrigerant pipe from an evaporator to a refrigerant compressor. Sun Effect. Heat from the sun that tends to increase the internal temperature of a space or building. Temperature, Absolute. Temperature measured on a scale for which zero is set at
273.16
C, or
459.69
F (presumably the temperature at which all molecular motion stops in a gas under constant pressure). The scale is called Kelvin, and Temperature, Design. An arbitrary design criterion used to determine equipment size to produce air conditioning, heating, or cooling capable of maintaining the designated temperature. Temperature, Dew Point. Temperature of air at which its wet-bulb temperature and dry-bulb temperature are identical and the air is fully saturated with moisture. Condensation of water vapor begins at this temperature and will continue if the temperature is reduced further. Temperature, Dry-Bulb. Temperature measured by a conventional thermometer. It is used to determine the sensible heat in air. Temperature, Effective. A single or arbitrary index that combines into a single value the effects of temperature, humidity, and air motion on the sensation of comfort. This value is that of the temperature of still, saturated air that will induce an identical feeling of comfort. Temperature, Wet-Bulb. Air temperature as indicated by a thermometer with a wet bulb. This temperature is less than the dry-bulb temperature, except when the air is fully saturated with water vapor, or at 100% relative humidity, when wet-bulb and dry-bulb temperatures will be equal. Ton, Refrigeration. Refrigeration effect equivalent to 200 Btu/min, or 12,000

Note: Bricks manufactured in Queensland, especially light-coloured bricks, may be more susceptible to acid burn, due to large amounts of iron oxide present in the raw materials. The following ratio could be substituted into Step 4 when acid cleaning these bricks: 1 part hydrochloric acid, 1 part phosphoric acid and 10 parts water. Contact Australs local technical department for further details. Further details of the recommended cleaning procedure and the various techniques used are available in the Think Brick Australia Manual 3 Cleaning of Clay Masonry Guide 2014. Cleaning Internal Brickwork Extra care should be taken when using hydrochloric acid to clean mortar stains on internal masonry. Acid fumes produced during cleaning should be ventilated adequately. The likelihood that the acid fumes will persist into the period of occupation can be reduced by: Cleaning the internal masonry early in the construction period, thereby allowing the walls to be rinsed sufficiently Ensuring adequate ventilation apply a neutralising solution to the wall. Brick Cleaning and Maintenance Brick Technical Manual 33