Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods. (MeSH, 2010)
A heaped pile of soil with adjacent crop parcels that are used to protect livestock and safeguard agricultural products in times of floods as well as droughts. (http://www.fao.org/3/a-i6613e.pdf)
The degree to which a price of a good changes as a result of a unit change in supply (= % change in quantity supplied / % change in price). (https://lod.nal.usda.gov/nalt/36123)
Thermodynamic equilibrium is an axiomatic concept of thermodynamics. It is an internal state of a single thermodynamic system, or a relation between several thermodynamic systems connected by more or less permeable or impermeable walls. In thermodynamic equilibrium there are no net macroscopic flows of matter or of energy, within a system or between systems. (https://en.wikipedia.org/wiki/Thermodynamic_equilibrium)
Radiocarbon dating uses the decay of a radioactive isotope of carbon (14C) to measure time and date objects containing carbon-bearing material. (Hajdas, I., Ascough, P., Garnett, M.H. et al. Radiocarbon dating. Nat Rev Methods Primers 1, 62 (2021). https://doi.org/10.1038/s43586-021-00058-7)
