Sentences with phrase «pressure air parcel»

In order to equalize the pressure difference between the the rising parcel and its new environment, air molecules inside the higher - pressure air parcel push out the sides of the parcel.

Not exact matches

Higher pressure increases the temperature of air parcels below.

Thus, if a parcel of air from the surface rises (because of wind flowing up the side of a mountain, for example), it undergoes an expansion, from higher to lower pressure.

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Bluetooth system, Cruise control + speed limiter, Door / boot open warning light, Exterior temperature gauge, IntelliLink infotainment system, Lights on warning, Low fuel level warning light, Rev counter, Service indicator, Speed sensitive power steering, Speed warning indicator, Trip computer, Vauxhall OnStar emergency assistance, VXR instrument panel, 6 speakers, Aux input, Fingertip controls for audio system, USB connection, «Smart» windscreen wipers, Automatic headlights and windscreen wipers, Body colour bumpers, Body colour door handles, Body coloured door mirrors, Dual exhaust pipes, Electric adjustable door mirrors, Electric front windows / one touch facility, Front fog lights, Headlamp levelling, Heated door mirrors, Heated rear windscreen, Heated windscreen, Laminated windscreen, LED daytime running lights, Rear diffuser, Rear wiper, Tinted glass including windscreen, VXR rear roof spoiler, Xenon headlights, 12V power outlet, 2 height adjustable rear headrests, 60/40 split folding rear seat, Adjustable dashboard illumination, Air recirculation system, Centre console with cupholders, Chrome gear knob, Chrome interior door handles, Delay courtesy light function, Driver / passenger reading lights, Driver / passenger sunvisors and vanity mirrors, Front seat belt pre-tensioners with load limiters, Grab handles, Heated front seats, Height adjustable driver's seat, Height adjustable front headrests, Height adjustable passenger seat, Height / reach adjust steering wheel, Illuminated glovebox, Interior courtesy light operated by all doors, Isofix on outer rear seats, Leather wrapped steering wheel, Lidded front door storage with drinks holder + armrest, Load restraining lashing points, Luggage compartment cover, Passenger under seat tray, Pollen filter, Rear bottle holder, Rear parcel shelf, Reclining front seats, Seatback map pocket, VXR floor mats, ABS + EBD + EBA, Brake assist, Driver / passenger 2 stage auto adaptive airbags, ESP + traction control, Front and rear curtain airbags, Front and rear seatbelt reminder, Front seat side impact airbags, Height adjustable front seatbelts, Hill start assist, Passenger airbag deactivation system, Three 3 point rear seatbelts, Tyre pressure monitoring system, Anti-drill door locks, Deadlocks, Immobiliser, Radio frequency remote central locking, Chrome effect speaker surrounds, Tyre inflation kit

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The parcel of air changes its own temperature and pressure at the same rate as the temperature and pressure of the surroundings changes.

That pressure difference is the buoyant force — the force that pushes up on the air parcel.

The parcel of air that you placed in the lower atmosphere is going to compress and warm because it finds itself in a place with higher pressure.

-- If a parcel of air is lifted, its pressure is DECREASED, since pressure decreases with height, and its temperature falls due to the expansion.

«As our air parcel expands in response to the lowering of the outside pressure, the force of its internal pressure is moving the walls of the container outwards.

By the time the outside air is compressed enough for the cabin (equivalent to quickly bringing that parcel of air adiabatically to surface pressure), it is typically too warm to be comfortable.)

The surrounding air presses in on the air parcel from all directions but the pressure along the sides of the parcel are equal and opposite and thus cancel.

Relative humidity is the fraction of water vapour in a small parcel of air relative to the total amount of water vapour the air could contain at the given temperature and pressure.

The expansion laterally increases pressure laterally but pressure from above stays the same because even if the atmosphere were to expand there would be the same number of molecules above the air parcel.

When an air parcel occasionally moves upward, its pressure changes as prescribed by the ambient conditions (e.g. of hydrostatic equilibrium).

i) The lower surface pressure arises once the air parcel begins to ascend.

That's essentially equivalent to the well known fact that adiabatic condensation occurs always in ascending convection where the parcel of air moves to lower pressure and cools.

Once it expands it pushes against the adjoining parcels so pressure increases in the horizontal plane but pressure in the vertical plane remains the same so the expanded and lighter air parcel moves in the direction of least resistance which is upward.

Thus a parcel of air into which water vapour is injected will rise without any change in ambient temperature.The reduction of density from surface upwards is what initially reduces air pressure as measured from the surface.

But on the other hand, condensation heats the air parcel and hence causes faster molecular motion and a rise in pressure, which is neglected in the calculations of M&G.

The local pressure reduction pointed to when condensation reduces volume is instantly offset by mass flowing into the original volume from the surroundings and the energy released is not enough to make the air parcel and the liquid contents lighter than air containing water vapour.

A parcel of air at constant volume — well, gas law and all, must be at constant pressure, unless the temperature changes.

At the surface, increased pressure from injecting water vapour into a parcel of air via evaporation causes the parcel to rise so that surface pressure below it falls.

ii) If pressure within an air parcel rises then the contents expand to occupy a larger space but that decreases density and weight which reduces pressure at the surface below.

The surrounding areas are effectively the entire rest of the global atmosphere so there is not going to be any significant pressure change outside the original air parcel.

Again, pressure in the vertical plane stays the same so the contracted and heavier air parcel moves in the direction of least resistance which is downward.

What makes air rise from the surface when evaporation occurs is increased pressure horizontally which increases buoyancy of the less dense parcel by forcing it upward vertically for a reduction of pressure at the base of the column.

Since liquid water weighs the same as the water vapor it condensed from, there is no change in the weight of the column of atmosphere above our parcel of air, whence the pressure remains unchanged, although the parcel may change (very slowly) in volume.

The problem is that the dynamic effect of latent heat (and the associated pressure gradients) can not be calculated considering the rising air parcel alone.

But if it loses pressure in some other way then it will suck air from its adjoining parcels to compensate, which will cause them to lose pressure.

If a parcel of air loses pressure due to its air escaping to an adjoining parcel, then it makes sense that pressure will increase in the latter.

People here are not distinguishing between localised pressure effects where one parcel of air abuts another and surface pressure effects as a result of a rising or descending column.

Stephen said, «What makes air rise from the surface when evaporation occurs is increased pressure horizontally which increases buoyancy of the less dense parcel by forcing it upward vertically for a reduction of pressure at the base of the column.»

The reason for the difference is that when air is rising it goes with the gravitational field so that the reducing pressure gradient with height ADDS adiabatic cooling to any further evaporative cooling within the air parcel

Evaporation initially reduces the density of the air within a convective cell below the global average and condensation simply restores the density within the cell to the global average so it is trite to suggest that the condensation process additionally reduces density and surface pressure outside the parcel.

In the first term of the Equation (3) above and for q, you considered energy of air pressure and that of gravity for an arbitrary air parcel and no sensible heat from the surroundings.

The wet - bulb temperature is the temperature an air parcel would have if it were cooled to saturation at constant pressure by evaporating water into the parcel.

Parcels of air move around the low pressure system.

Given two almost identical parcels of air at the same temperature and pressure, the one with more water vapor will be less dense.