There is a double tube exchanger, in which you have glycerin flowing in the inner tube at a rate of 2.5 Kg / s, it enters at a temperature of 600 ° C and it exits at a temperature of 100 ° C, and from the outside you have water which enters at a temperature of 20 ° C, at a rate of 1.0 Kg / s, if the resistance to total heat flow is 150 KW/m^2*K, determine the value of the conduction coefficient of the pipe, if the inner pipe it is nominal 1 1/2 "Schedule 80, and the outer piping is nominal 2" Schedule 80. The system is in parallel with flows large enough to neglect convection.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).