0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
In which reservoir does a water molecule spend the most time?
oceans
What is Difference between residence time and space time?
Residence time is the time it takes a particle to complete the cycle. Space time is volume of the reactor over the velocity. If the volume does not change and the velocity remains constant then Residence time = space time, however, if there is a disturbance in the reactor (i.e., change in pressure, temp, ect.), then residence time does not equal to space time.
What is the formula for calculating residence time?
the hydraulic residence time t is given by t=V/q where V is the volume in the tank and q is the volumetric flow rate. A theoretical residence time can be given by the relationship between concentration and time ln(C)=-(t/tav) where tav in this equation is the residence time.
When heating a sample of pure water to the boiling point why doesn't all of the water instantly vaporize when you reach the boiling point?
as each molecule of water evaporates it takes heat with it, lowering the temperature of the surrounding water, so it takes time before every molecule evaporates.
Why volume PFR less than CSTR for same conversion and reaction rate?
The reason that a PFR requires less volume than a CSTR is the difference in residence time distribution between the reactors. Residence time is the amount of time molecules spend in the reactor which equal to v/vo (v=volume of the reactor and v0 is volumetric flow rate). Let us assume that we design a PFR and CSTR that have similar residence time i.e. ratio of volume v and v0 is the same and we are pumping about 100 molecule per minute to each reactor. In the case of PFR, all the 100 molecules will spend exactly the same time inside the reactor (v/v0). In the case of CSTR, things are little more complicated, once the 100 molecule hit the CSTR, they mixted instantaneously and thus some of these 100 molecules will leave from the reactor exit stream very early i.e. will spend much less time inside the reactor (less the v/v0) and of course some these 100 molecule will spend more time making the average residence time the same as the PFR. Therefore, with the chance that molecules will spend shorter time in CSTR, we try to compensate for that effect by making bigger reactors so the ratio of these molecules spending short period of time inside the reactor less and thus its performance is comparable to the PFR. Very logical and easy to understand explanation. But how to prove series of CSTR equals to one PFR which is having a volume of sum of all CSTRs?
Residence time of water molecule in the ocean is---?
Residence time of water molecule in the ocean is estimated to be 3000 years. This answer is wrong because this question was asked in exam for the post of junior engineer and the options were- a) 3.5 year b) 3.5 million years c) 35 years d) 35000 years So answer is one from the above..
Average residence time?
The average residence time is a measure of the time it takes for the total stock or supply of the material to be cycled through a system. To compute the average residence time (T; assuming constant size of the system and constant rate of transfer), we take the total size of the stock (S) and divide it by the average rate of transfer (F) through the system: T=S/F. Example if a reservoir holds 100 million cubic meters of water, and both the average input from streams entering the reservoir and the average output over the spillway are 1 cubic meter per second, then the average residence time for a cubic meter of water in the reservoir is 100 million seconds, or about 3.2 years.
What is the residence time of water in the atmosphere?
.024 years or nine days
How long could a fresh water molecule size 54hz be stable?
Can a water molecule size 54hz be stable for a period of time?
In which reservoir does a water molecule spend the most time?
oceans
What is the attraction between a water molecule and olive oil molecule?
They don't attract, in fact they repel, which is why oil and water separate when left for a period of time.
Can you purchase water credits in pebble beach for a home residence?
I believe you can but only for a limited time.
Describe the pathway followed by a water molecule from the time it enters a plant root to the time it enters a plant root to the time it escapes into the atmosphere from a leaf?
Describe the pathway followed by a water molecule from the time it enters a plant root to the time it escapes into the atmosphere from a leaf.
How are inputs outputs residence time and recharge related to aquifers?
inputs help aquafy the water outputs release the water from the aquifer
Where do shared electrons of a water molecule tend to spend more time?
Hydrogen
The average length of time the various salts remain in the ocean before cycling out of the ocean is known as the time?
The average length of time the various salts remain in the ocean before cycling out of the ocean is known as the residence time. This is also known as the removal time.
What kind of molecule is the hydrogen molecule?
it is one of the molecules in water or h20. hydrogen is a gas and is inside water and you drink it every time you drink water. Hydrogen can be also used to power hydrogen powered cars.
