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This article builds a theory of enviromateriality through a global ethnography that engages both the material culture and materiality of a tree species, Honduran mahogany (Swietenia macrophylla), and the global political ecology of forest conservation. The author seeks to understand what Adorno calls the 'constellation' between people and mahogany by tracing human-nature relations through the global commodity chain focusing on one particular artefact, the Gibson Les Paul, an iconic solid wood electric guitar made primarily of mahogany grown in Mexico and Fiji. Enviromateriality considers three phases in which to examine the material and materiality in a variety of processes that are interconnected. These phases allow for an examination of local community relations with mahogany as trees and products, and whether certified mahogany helps create sustainability and social justice. The author also examines guitar players' relations with their mahogany guitars, particularly focusing on the aesthetics that make the Les Paul desired, as well as the sonic and tonal agentic force that they consider mahogany to have.It is a question of surrendering to the wood, then following where it leads by connecting operations to a materiality. (Deleuze and Guattari, A Thousand Plateaus, 1980: 408)

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An equation model for calculating the adiabatic temperature of the wet-bulb thermometer has been obtained empirical fit through a meteorological database, specificly a trough relative humidity and air temperature. A comparison of the results of calculations with the use of this equation and from meteorological database was made. The model deducted of the comparison is valid for a dry bulb temperature range of 3˚C to 35˚C and for relative humidity percentage in a range of 7% to 97%. Normalized errors are less than 5.5%. It means a maximum variation of 0.55˚C from data. However, this variation from error represents only 3.6% of the data sample. The equation model was satisfactory.