if a 150 gram liquid, of which 45% is sugar, vaporizes, how many grams of sugar will be left? and what would be the formula to solve this?

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.