What can cause attention deficit hyperactivity disorder (adhd)?

The exact cause of ADHD is not well known, however, some of the factors, which can lead to the condition. These are as follows:  

1. Genetic factors, as ADHD seems to run in families.  

2. Chemical imbalance taking place in the brain.  

3. Infections, poor nutrition, smoking, substance abuse at the time of pregnancy, and drinking.  

4. The toxins like lead can influence the development of the brain of a child.  

5. A brain disorder or brain injury, that is, destruction to the frontal part of the brain can result in the issues associated with ADHD.  

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.