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In aviation, ceiling is a measurement of the height of the base of the lowest clouds (not to be confused with cloud base which has a specific definition) that cover more than half of the sky (more than 4 oktas) relative to the ground.
Ceilings are classified according to their appearance or construction. A cathedral ceiling is any tall ceiling area similar to those in a church. A dropped ceiling is one in which the finished surface is constructed anywhere from a few inches or centimeters to several feet or a few meters below the structure above it.
The crown is the spreading top of a tree including the branches and leaves, [29] while the uppermost layer in a forest, formed by the crowns of the trees, is known as the canopy. [30] A sapling is a young tree. [31] Many tall palms are herbaceous [32] monocots, which do not undergo secondary growth and never produce wood.
The cloud height, more commonly known as cloud thickness or depth, is the distance between the cloud base and the cloud top. [1] It is traditionally expressed either in metres or as a pressure difference in hectopascal (hPa, equivalent to millibar ).
The silver maple tree is a relatively fast-growing deciduous tree, commonly reaching a height of 15–25 m (49–82 ft), exceptionally 35 m (115 ft). Its spread will generally be 11–15 m (36–49 ft) wide. A 10-year-old sapling will stand about 8 m (26 ft) tall.
The height of the Central Hall ceiling made this a complicated and expensive process, requiring floor-to-ceiling scaffolding across the length and width of the Central Hall. [93] The need to avoid damage to the fragile mosaic flooring and the terracotta tiling on the walls caused further difficulty in erecting the scaffolding. [94]
Even a facility built specifically for basketball players poses challenges to the 7-foot-6 center.
The service ceiling is the maximum altitude of an aircraft during normal operations. Specifically, it is the density altitude at which flying in a clean configuration , at the best rate of climb airspeed for that altitude and with all engines operating and producing maximum continuous power, will produce a given rate of climb.