<P> The single combination of pressure and temperature at which liquid water , solid ice , and water vapor can coexist in a stable equilibrium occurs at exactly 273.16 K ( 0.01 ° C ; 32.02 ° F ) and a partial vapor pressure of 611.657 pascals ( 6.11657 mbar ; 0.00603659 atm ) . At that point , it is possible to change all of the substance to ice , water , or vapor by making arbitrarily small changes in pressure and temperature . Even if the total pressure of a system is well above the triple point of water , provided that the partial pressure of the water vapor is 611.657 pascals , then the system can still be brought to the triple point of water . Strictly speaking , the surfaces separating the different phases should also be perfectly flat , to negate the effects of surface tension . </P>
<P> The single combination of pressure and temperature at which liquid water , solid ice , and water vapor can coexist in a stable equilibrium occurs at exactly 273.16 K ( 0.01 ° C ; 32.02 ° F ) and a partial vapor pressure of 611.657 pascals ( 6.11657 mbar ; 0.00603659 atm ) . At that point , it is possible to change all of the substance to ice , water , or vapor by making arbitrarily small changes in pressure and temperature . Even if the total pressure of a system is well above the triple point of water , provided that the partial pressure of the water vapor is 611.657 pascals , then the system can still be brought to the triple point of water . Strictly speaking , the surfaces separating the different phases should also be perfectly flat , to negate the effects of surface tension . </P>
what three forms of ice are present at the triple point marked o
what three forms of ice are present at the triple point marked o
liquid water solid ice water vapor
liquid water solid ice water vapor