small text fix in Fundamentals of Thermodynamics

book/content/modelling/04_thermodynamics/01_fundamentals.ipynb

@@ -74,9 +74,9 @@
     "\n",
     "Some examples of function of states are:\n",
     "\n",
-    "* **internal energy** $\\mf U$: the sum of kinetic and potential energy of all microscopic particles composing the system;\n",
-    "* **enthalpy** $\\mf H$: the sum of internal energy of the system and the product of its pressure and volume; and\n",
-    "* **entropy** $\\mf S$: degree of disorder or uncertainty of a system.\n",
+    "* **internal energy**, $\\mf U$: the sum of kinetic and potential energy of all microscopic particles composing the system;\n",
+    "* **enthalpy**, $\\mf H$: the sum of internal energy of the system and the product of its pressure and volume; and\n",
+    "* **entropy**, $\\mf S$: degree of disorder or uncertainty of a system.\n",
     "\n",
     "## Process functions\n",
     "\n",
@@ -96,7 +96,7 @@
     "\n",
     "## Classification of boundaries\n",
     "\n",
-    "The interactions between a system and the surroundings are determined by the nature of the system boundary. There are four definitions of system boundaries between systems and surroundings:\n",
+    "The interactions between a system and the surroundings are determined by the nature of the system boundary. There are four definitions of boundaries, which implicate in different types of interactions between the system and the surroundings:\n",
     "\n",
     "* **closed**: no mass flow, possibility for heat flow ($\\mf \\Delta Q\\neq 0$) and / or work to be done ($\\mf \\Delta W\\neq 0$);\n",
     "* **open**: possibility for mass and heat flow, as well as for work to be done;\n",