When a system, for example, n moles of a gas of volume V at pressure p and temperature T, is created or brought to its present state from absolute zero, energy must be supplied equal to its internal energy U plus pV, where pV is the work done in pushing against the ambient ( atmospheric ) pressure.

When transformed into Phoenix, Jean's powers escalate to an incalculable level, allowing her to rearrange or disintegrate matter at a subatomic level, fly unaided through space, survive in any atmosphere, and manipulate electromagnetic and cosmic energies for various effects and atmospheric disturbances.

When a meteoroid enters the atmosphere, frictional, pressure, and chemical interactions with the atmospheric gasses cause the body to heat up and emit light, thus forming a fireball, also known as a meteor or shooting / falling star.

When plants fix atmospheric carbon dioxide () into organic matter during photosynthesis they incorporate a quantity of that approximately matches the level of this isotope in the atmosphere.

When these fluctuations were explained as a manifestation of changes in atmospheric pressure, the science of meteorology was born.

When dry it is a light flaky powder, which readily absorbs up to 40 % of its weight in atmospheric water.

When the cement paste exposed to the air and meteoric water reacts with the atmospheric CO < sub > 2 </ sub >, portlandite and the Calcium Silicate Hydrate ( CSH ) of the hardened cement paste become progressively carbonated and the high pH gradually decreases from 13. 5 – 12. 5 to 8. 5, the pH of water in equilibrium with calcite ( calcium carbonate ) and the steel is no longer passivated.

When surface temperature drops, eventually reaching the dew point, atmospheric water vapor condenses to form small droplets on the surface.

When a front passes over an area, it is marked by changes in temperature, moisture, wind speed and direction, atmospheric pressure, and often a change in the precipitation pattern.

When the closed valve is opened, airflow will result from the cavity behind the initial closure outward until intraoral pressure is equal to atmospheric pressure.

When the layer is particularly strong during periods of high sunspot activity, FM and TV reception can take place over 2000 miles ( 3000 km ) or more, as the signal effectively " bounces " off the high atmospheric layer.

When that breath is exhaled back into the surrounding environment, it has an oxygen level in the range of 15 to 16 % when the diver is at atmospheric pressure.

When the flow of air comes from the northeast due to a widespread low pressure area over the Atlantic and atmospheric disturbances over France, the air is even colder at both high altitudes and ground level, and the mistral is even stronger, and the weather worse, with the creation of cumulus clouds bringing weak storms.

When the pressure is below that within the lungs, the lungs expand and atmospheric pressure pushes air from outside the chamber in via the person's nose and airways to keep the lungs filled ; when the pressure goes above that within the lungs, the reverse occurs, and air is expelled.

When producing lift, air below the wing is generally at a higher pressure than the air pressure above the wing, while air above the wing is generally at a lower than atmospheric pressure.

When the atmospheric pressure variations in the North Atlantic are large, the springs in Europe are warmer.

When Joseph Priestley came to Birmingham in 1780, he found an able assistant in Keir, who had discovered the distinction between carbon dioxide gas and atmospheric air.

When both ends of a siphon are at atmospheric pressure, liquid flows from high to low.

When there is rain in the mountains surrounding the Harbour, the tide rises, and it falls when the atmospheric pressure reverses and results in less rain.

When atmospheric refraction is considered, the absolute air mass integral becomes

When the throttle is closed, the relative manifold pressure drops below atmospheric pressure and the resulting pressure differential operates the blowoff valve's piston.

When that happens Pirs could become the first permanent ISS module to be decommissioned, and would be destroyed during atmospheric re-entry.

When the pressure of the gas inside the fermentation vessel exceeds the prevailing atmospheric pressure the gas will push its way through the water as individual bubbles into the outside air.

When multiple atmospheric layers are stacked upon each other, the slope of isobaric surfaces increases with height.

When the throttle is opened all the way, the engine's air induction system is exposed to full atmospheric pressure, and maximum airflow through the engine is achieved.

When improvements are recommended in working conditions -- such as lighting, rest rooms, eating facilities, air-conditioning -- do you try to set a measure of their effectiveness on productivity??

When paper electrophoresis was to be used for preparation, eight strips of a whole serum sample or a chromatographic fraction concentrated by negative pressure dialysis were run/chamber under the conditions described above.

When conditions are particularly inhospitable on land, larval breeding may allow continuation of a population that would otherwise die out.

When the appropriate conditions above are satisfied a system is said to be asymptotically stable: the variables of an asymptotically stable control system always decrease from their initial value and do not show permanent oscillations.

When the overstory regrows, seeds of annuals and smaller plants may lie dormant until the next fire creates the conditions required for germination.

This absence of investment contributes to the marginalisation of these zones. When unfavourable agro-climatic conditions are combined with an absence of infrastructure and access to markets, as well as poorly adapted production techniques and an underfed and undereducated population, most such zones are excluded from development.

When reactant concentrations differ from standard conditions, the cell potential will deviate from the standard potential.

When a field travels across to different media, the properties of the field change according to the various boundary conditions.

When Portuguese explorers first came into contact with the Japanese ( see Nanban period ), they described Japanese conditions in analogy, likening the Emperor, with great symbolic authority but little political power, to the Pope, and the Shogun to secular European rulers, e. g. the Holy Roman Emperor.

When investigating the causes of seizures, it is important to understand physiological conditions that may predispose the individual to a seizure occurrence.

When this warming or cooling occurs for only seven to nine months, it is classified as El Niño / La Niña " conditions "; when it occurs for more than that period, it is classified as El Niño / La Niña " episodes ".

When El Niño conditions last for many months, extensive ocean warming and the reduction in Easterly Trade winds limits upwelling of cold nutrient-rich deep water and its economic impact to local fishing for an international market can be serious.

When a fighter is launched it is almost immediately followed by the VC10 as changeable weather conditions might make diversion to another airfield necessary.

When his mother returned to work as a lady's maid ( at Uppark, a country house in Sussex ), one of the conditions of work was that she would not be permitted to have living space for her husband and children.

When the living and working conditions of the laborers became known public opposition to the scheme grew and questions were asked in the British Parliament.

When conditions are harsh, often before winter or in poor feeding conditions, sexual reproduction occurs in some hydras.

When health conditions warrant, immune system organs including the thymus, spleen, portions of bone marrow, lymph nodes and secondary lymphatic tissues can be surgically excised for examination while patients are still alive.

When conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together, or it can fill fractures.

When blood flow is suppressed, glutamate is released from presynaptic neurons causing NMDA and AMPA receptor activation moreso than would normally be the case outside of stress conditions, leading to elevated Ca < sup > 2 +</ sup > and Na < sup >+</ sup > entering the post synaptic neuron and cell damage.

When we repeat an experiment, as the saying goes, we really perform another experiment with a ( more or less ) similar set of generating conditions.

When Portuguese explorers first came into contact with the Japanese ( see Nanban period ), they described Japanese conditions in analogy, likening the emperor, with great symbolic authority but little political power, to the Pope, and the shogun to secular European rulers, e. g. the King of Spain.

When the African slave trade began in 1673, the difficult conditions and inhumane treatment slaves were subjected to bred discontent.

When the treaty was discussed in parliament in December of the preceding year, though suffering from a severe attack of gout, he was carried down to the House, and in a speech of three hours ' duration, interrupted more than once by paroxysms of pain, he strongly protested against its various conditions.

When this culture is kept in the right conditions, it will continue to grow and provide leavening for many years.