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Fans may be used within a case to encourage the movement of air and minimize adsorption of moisture on the glass surface. Deterioration is more likely to occur in areas with restricted air-flow which allow moisture to remain on the glass. [14] Chemical methods for retarding corrosion rates and stabilizing surfaces are being investigated. [4]
Crazing is a spider web pattern of cracks penetrating the glaze. It is caused by tensile stresses greater than the glaze is able to withstand. [1] [2] Common reasons for such stresses are: a mismatch between the thermal expansions of glaze and body; from moisture expansion of the body; and in the case of glazed tiles fixed to a wall, movement of the wall or of the bonding material used to fix ...
Air naturally stratifies, i.e. warmer air rises to the ceiling while cooler air sinks, meaning that colder air settles near the floor where people spend most of their time. A ceiling fan, with its direction of rotation set so that the warmer air on the ceiling is pushed down along the walls and into the room, heating the cooler air.
The relationship between pressure and leakage air flow rate is defined by the power law between the airflow rate and the pressure difference across the building envelope as follows: [16] q L =C L ∆p n. where: q L is the volumetric leakage airflow rate expressed in m 3 h −1; C L is the air leakage coefficient expressed in m 3 h −1 Pa −n
Infiltration is the unintentional or accidental introduction of outside air into a building, typically through cracks in the building envelope and through use of doors for passage. [1] Infiltration is sometimes called air leakage. The leakage of room air out of a building, intentionally or not, is called exfiltration.
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A deadly Osprey aircraft crash last November off Japan was caused by cracks in a metal gear and the pilot’s decision to keep flying rather than heed multiple warnings that he should land ...
Edge strength: crack will form if the tensile strength of glass edge exceeds the critical point. Clean cut glass is the strongest and after that polished edge is strongest. Artificial heating and cooling: if heating or cooling vents are present, the glass can heat or cool excessively and may result in thermal stress.