when temperature rises,pressure increases or decreases?and what when it drops?

Answer 1

In VERY general terms, expect the pressure to be on the decline with southwest winds when the temperature rises.

The opposite for temperature dropping: Pressure is generally rising on northwest winds.

This has to do with the rotation around high & low pressure systems.

Answer 2

I presume that you are asking about atmospheric pressure.In that case, pressure decreases with a rise in temperature.This can be noticed in the barograph chart where continuous record of pressure values is available for 24 hours.The pressure value will be minimum when the maximum temperature is recorded in a thermograph which gives a continuous record of temperature.Both instruments show the diurnal variation of pressure and temperatures respectively.
What actually happens is given below.
When a particular place is heated more by the solar radiation,it heats the air above it and the air becomes less dense and rises.Sorrounding cool air occupies its place and it is also heated and it also rises.This process continues.As the air column above that place becomes less dense,the weight (and hence the pressure)also becomes less.
In the general formula connecting pressure and temperature ,pressure will increase with temperature only if volume remains the same which is not possible in the earth's atmosphere.

Answer 3

I am assuming since this is in the weather category, that you mean the atmospheric pressure and not pressure within a closed vessel of fixed volume.

The first two people are trying to tell everyone that the atmosphere is contained. It is not. Air in the free atmosphere is not contained so when air is heated it becomes less dense. Since it is less dense, it becomes lighter (that is why hot air rises)

If the air is less dense than surrounding cooler (more dense air) and it is less dense and there fore less mass all the way to the top of the atmosphere, then it has less atmospheric pressure (as measured by a barometer) than cooler, denser air which has higher density and mass.

That is why air pressure during the winter in the northern hemisphere, the highs have much higher pressure than during the summer.

It is also noticeable in daily pressure fluctuations where the lowest pressure of the day (unless acted on by other weather features) is normally in the early evening when the over all atmospheric temperature is at a maximum.

Answer 4

General Gas Law ;
VP = nrT where r is a constant peculiar to the gas being analyzed and n is the number of moles (molecules divided by Avogadro's number) of gas. V is the Volume of gas, P is the pressure and T is the Temperature.
n and r will be constant throughout the equations so we can set them aside to get VP = T.
Assuming V to remain the same as it would in a closed container, an increase in temperature means a proportional increas in pressure; and a decrease in temperature results in a proportional decrease in pressure. This is why a balloon will shrink when it gets cold.

Answer 5

there is a difference between 'weather' and 'climate' Weather is about what a specific place experienced this year, or even what a specific latitude tended to experience this year... Climate change is about extreemly tiny changes, usually over a very long time. Over the same time period that contains the especially hot year 33/34, we have also had especially cold years, mostly due to volcanic activity blocking sunlight. The years of volcanic activity do not indicate we are sliding into an ice age, and the data of 1933/34 do not indicate that the climate has suddenly changed, and now the whole globe is warmed... It is *weather* (not climate). It is the *trend* in *weather* that is described as *climate change*. "The past nine years are all among the 25 warmest on record for the contiguous United States, a streak unprecedented in records dating back to 1896." according to NOAA. If you look at the table below, you will see very few years before 1941 as '25 warmest' - 6/25. If you look closer you will see *no* years before WWI 0/25.The odds that this is a matter of chance, rather than an indication of a climate trend, is vanishingly small. Look at it this way: 1997-2006 9:10 in the hottest 25 1987-1996 4:10 " " 1977-1986 2:10 " " 1967-1976 0:10 " " Do *YOU* see a long term trend? It is legitimate to question global warming on only a data set covering about 150 years,.. But there are other indicators, such as the melting of ice sheets and glaciers, that show that it has not been this warm since the last interglacial period. There are also cores of ice that have trapped air hundreds of thousands of years old containing CO2 levels, and other indicators of global temp. There are cores of lake sediments showing how much organic matter happened yearly over extremely long periods, and also tree rings matched up with the rings of preserved trees in bogs and swamps... These things extend the range of comparison without providing exact temps. They *all* indicate that the climate is warming unusually rapidly for a new interglacial period, and that a gas that human cultures emit in very large quantities is correlated very well with this change.

Answer 6

Good question but you haven't gotten any correct answers yet. A useful form of the ideal gas law can be written as
p = d R T where d is density, T is temperature, and R is a constant. We can see from this equation that if we change one variable T by increasing it there will be two variables left, density and pressure. It is not possible to determine what will happen to the pressure without knowing precisely what is happening to the density. Perhaps this can be seen a little better if we differentiate the equation with respect to time

dp/dt = R [d dT/dt + T dd/dt ]. If we know the density and the change in density with respect to time and the temperature and the change in temperature with respect to time we can then specify the change in pressure with respect to time.

Answer 7

PV = nRT, where
P = pressure
V =Volume, and
T = Temperature
(n and R are constants)

what this equation shows is that pressure and temperature are proportional; if temperature increases, then pressure will also increase in fixed volume container.

Answer 8

For an ideal gas, if the volume is maintained constant,
P/T= constant,so
if the temperature is raised, the pressure increases and if the temperature is lowered, the pressure decreases.

Answer 9

When temperature increase, the pressure increases and the other way around.

Answer 10

Just think of a container with a liquid in it.

Heat it up, it will gain pressure till it explodes.