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Each gram molecule of condensing water will bring about a marked 1200-fold plus reduction in volume.The simultaneous release of latent heat will drive air from below to fill the partial vacuum. The energy required for the surrounding air to move in is readily calculated from the small (one-fifteenth of latent heat) reduction in temperature.
The wet-bulb temperature is the lowest temperature that may be achieved by evaporative cooling of a water-wetted, ventilated surface.. By contrast, the dew point is the temperature to which the ambient air must be cooled to reach 100% relative humidity assuming there is no further evaporation into the air; it is the temperature where condensation (dew) and clouds would form.
The specific enthalpy of fusion (more commonly known as latent heat) of water is 333.55 kJ/kg at 0 °C: the same amount of energy is required to melt ice as to warm ice from −160 °C up to its melting point or to heat the same amount of water by about 80 °C. Of common substances, only that of ammonia is higher.
The terms sensible heat and latent heat refer to energy transferred between a body and its surroundings, defined by the occurrence or non-occurrence of temperature change; they depend on the properties of the body. Sensible heat is sensed or felt in a process as a change in the body's temperature.
Transpiration cools plants, as the evaporating water carries away heat energy due to its large latent heat of vaporization of 2260 kJ per liter. This section is an excerpt from Transpirational cooling (biological) .
“If temperature gets high enough, heat stress can kill living plant tissues even if they have water,” said Hammond. Nathan Gilles is a science writer and journalist based in Vancouver, Washington.
“We saw damage to plants this summer that had never showed heat stress before,” Schilling said. Sunburned leaves of a mock orange shrub on Aug. 23. Brown patches show where the tissue was damaged.
Knowing this, Southern gardeners must always put research before planting, whether filling up a container garden or planning landscaping around their homes. Rejane Parker, Director of Gardens at ...