A fern is a member of a group of approximately 12,000 species of vascular plants that reproduce via spores and have neither seeds nor flowers.They differ from mosses by being vascular (i.e. having water-conducting vessels). They have stems and leaves, like other vascular plants.ost ferns have what are called fiddleheads that expand into fronds, which are each delicately divided. Leptosporangiate ferns (sometimes called true ferns) are by far the largest group, but ferns as defined here (ferns sensu lato) include horsetails, whisk ferns, marattioid ferns, and ophioglossoid ferns.
The density of H 2 O at 39.8 Â°C is 0.992 g/mL. Solution. Raoult's Law can be used to express the vapor pressure relationships of solutions containing both volatile and nonvolatile solvents. Raoult's Law is expressed by. P solution = Ï solvent P 0 solvent where. P solution is the vapor pressure of the solution.
Newtonâs Law of Cooling states that the rate of change of temperature of an object is proportional to. the temperature difference between it and the surrounding medium; using Tambient for the ambient. temperature, the law is âTÃªât=-KHT-TambientL, where T is temperature, t is time, and K is a. constant related to efficiency of heat transfer.