It is 4 because if you think about it it makes more sense
That would be the proton. The number of protons in the nucleus determine which element it is and its properties.
Minerals can be identified by their physical characteristics. The physical properties of minerals are related to their chemical composition and bonding. Some characteristics, such as a mineral’s hardness, are more useful for mineral identification. Color is readily observable and certainly obvious, but it is usually less reliable than other physical properties.
It will occupy 18 L volume when the pressure is changed to 0. 5 atm and the temperature remain constant.
Calculation,
According to Boyle law, the pressure of a given quantity of gas varies inversely with its volume at constant temperature.
.....(i)
is initial pressure = 3 atm
is initial volume = 3L- k is constant
(ii)
is final pressure = ?
is final volume = 0.5atm- k is constant
Combining equation (i) and (ii). we get,
3 atm× 3L= × 0.5atm
= 3 atm× 3L/0.5atm = 18 L
Boyle law used during respiration or breathing.
To Learn more about Boyle law
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