When a molten metal is mixed with another substance, there are two mechanisms that can cause an alloy to form, called atom exchange and the interstitial mechanism.

When tested in patients, the research substance LY2140023 yielded promising results and had few side effects.

When certain ionic compounds containing bromine are mixed with potassium permanganate ( KMnO < sub > 4 </ sub >) and an acidic substance, they will form a pale brown cloud of bromine gas.

When particles in a beam are thrown against a foil made of a certain substance, the cross section is a hypothetical area measure around the target particles of the substance ( usually its atoms ) that represents a surface.

When a particular substance, whether chemical or biotic — reaches unsafe levels in the bloodstream, the body can effectively dilute — or at least maintain equilibrium of — the offending substances by storing it in new fat tissue.

When the reactive substance comes in contact with the resin, it will bond to it, removing it from the air stream.

When jewelry containing sapphires or rubies is heated, it should not be coated with boracic acid or any other substance, as this can etch the surface ; they do not have to be " protected " like a diamond.

When the electric field applied across an insulating substance exceeds in any location the threshold breakdown field for that substance, the insulator suddenly becomes a conductor, causing a large increase in current, an electric arc through the substance.

When dissolving a lipophilic or amphiphilic substance in a polar environment, the polar molecules ( i. e., water in an aqueous solution ) become more ordered around the dissolved lipophilic substance, since the polar molecules cannot form hydrogen bonds to the lipophilic areas of the amphiphile.

When all atoms are arranged in a substance so that each neighbor is ' anti-aligned ', the substance is antiferromagnetic.

When a substance melts and the solid and liquid phases are in an equilibrium, it maintains a constant temperature, the melting point.

When the Ptolemies stopped exporting papyrus, partly because of competition and shortages, the Pergamenes invented a new substance to use in codices, called pergaminus or pergamena ( parchment ) after the city.

: Your eyes have seen my unformed substance ; And in Your book were all written The days that were ordained for me, When as yet there was not one of them.

When used non-technically, the term " toxin " is often applied to any toxic substance.

When combined with an MDMA or an MDMA-like substance, serotonin syndrome can result.

When one substance is dissolved into another, a solution is formed.

When a solid is heated above its melting point, it becomes liquid, given that the pressure is higher than the triple point of the substance.

When the " characteristic freezing point " of a substance is determined, in fact the actual methodology is almost always " the principle of observing the disappearance rather than the formation of ice ", that is, the melting point.

When jewelry containing rubies is heated ( for repairs ) it should not be coated with boracic acid or any other substance, as this can etch the surface ; it does not have to be " protected " like a diamond.

When the endocervix is exposed to the harsh acidic environment of the vagina it undergoes metaplasia to squamous epithelium which is better suited to the vaginal environment.

When a doctrine undergoes this procedure, the LDS Church treats it as the word of God, and it is used as a standard to compare other doctrines.

When a silver-109 atom, which comprises approximately half of all silver in existence, catches a neutron, it undergoes a beta decay to become cadmium-110.

When the blade of an ice skate passes over the ice, the ice undergoes two kinds of changes in its physical state and a change in temperature due to kinetic friction and the heat of melting.

When an atom undergoes nuclear fission, a few neutrons ( the exact number depends on several factors ) are ejected from the reaction.

When a heavy atom undergoes nuclear fission it breaks into two or more fission fragments.

When enough energy is deposited in a droplet by ionizing radiation the superheated droplet undergoes a phase transition and becomes a gas bubble.

When a cell switches to the biofilm mode of growth, it undergoes a phenotypic shift in behavior in which large suites of genes are differentially regulated.

When a material undergoes a phase change from solid to liquid or from liquid to gas the thermal conductivity may change.

When an object rotates about its axis, the motion cannot simply be analyzed as a particle, since in circular motion it undergoes a changing velocity and acceleration at any time ( t ).

When the disk undergoes a full clockwise revolution, the bicycle wheel will not return to its original position, but will have undergone a net rotation of.

When the external form undergoes the greatest change, as from an aquatic insect to a flying gnat, a caterpillar to a crysalis, a crysalis to a butterfly, or a tadpole to a frog, there is nothing new in the organization ; all the parts of the gnat, the butterfly, and the frog, having really existed, though not appearing to the common observer in the forms in which they are first seen.

When some X is produced, X's matter is what undergoes the change into X and remains constant throughout the process.

When a monocyte enters damaged tissue through the endothelium of a blood vessel, a process known as the leukocyte extravasation, it undergoes a series of changes to become a macrophage.

When an inducer is bound by the activator protein, it undergoes a change in conformation so that it can bind to the DNA and activate transcription.

When the solute undergoes ionic dissociation in solution ( a salt e. g. ), the system becomes decidedly non-ideal and we need to take the dissociation process into consideration.

When a star has exhausted all its energy and undergoes stellar death, the gas pressure of the hot interior can no longer support the weight of the star and the star collapses to a denser state: a compact star.

When cannibalism is complete, the giant diploid cell is a hardy macrocyst which eventually undergoes recombination and meiosis, and hatches hundreds of recombinants.

When the nucleus of uranium-235 absorbs a neutron, it undergoes nuclear fission, splitting into two " fission products " and releasing energy and, on average, 2. 5 neutrons.

When a rock undergoes partial melting some minerals will melt ( Neosome, i. e. newly formed ) while others remain solid ( Paleosome, i. e. older formation ).

When Cú Chulainn wakes he undergoes a spectacular ríastrad or " distortion ", in which his body twists in its skin and he becomes an unrecognisable monster who knows neither friend nor foe.

When R and M are taken as constant, then pressure P can stay constant as the density-temperature quadrant ( ρ, T ) undergoes a squeeze mapping.

* When a labeled chemical compound undergoes chemical reactions one or more of the products will contain the radioactive label.

When cooled below approximately 870 millikelvin, the mixture undergoes spontaneous phase separation to form a < sup > 3 </ sup > He-rich phase ( the concentrated phase ) and a < sup > 3 </ sup > He-poor phase ( the dilute phase ).