Account for Water in a Simple Model - Practice 1

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Define the boundary of the model before counting. Initial water plus inflow minus outflow gives what remains when no other transfers occur. Evaporation is an outflow from the liquid store, not destruction of water.

Worked example

A model tray begins with 50 mL, receives 20 mL, and loses 10 mL to evaporation. The liquid store ends with 60 mL.

Question 1 Fictional liquid-water store: start 50 mL, inflow 20 mL, evaporation 10 mL, no other transfers. How many mL remain as liquid? Answer

Question 2 Fictional liquid-water store: start 55 mL, inflow 20 mL, evaporation 11 mL, no other transfers. How many mL remain as liquid? Answer

Question 3 Fictional liquid-water store: start 60 mL, inflow 20 mL, evaporation 12 mL, no other transfers. How many mL remain as liquid? Answer

Question 4 Fictional liquid-water store: start 65 mL, inflow 20 mL, evaporation 13 mL, no other transfers. How many mL remain as liquid? Answer

Question 5 Fictional liquid-water store: start 70 mL, inflow 20 mL, evaporation 14 mL, no other transfers. How many mL remain as liquid? Answer