It does this by doing one or both of the following things: (1) increasing the amount of internal energy within the system and/or (2) doing external work by leaving the system, thereby affecting the area around the system.įor example, after you added water to your pot to boil, you added energy to the system by heating it. It states that when heat is added to a system, it transforms to an equal amount of another form of energy. The first law of thermodynamics describes the conservation of energy. We'll take a look at two of these, known as the first and second laws of thermodynamics.
The scientific processes you witnessed in the kitchen also reflected a couple of scientific truths known as laws of thermodynamics. When scientists study the amount of thermal energy and its movement in and out of systems, we call that field of study thermodynamics. If you think about it, you used water in each of its states: liquid water went into the pot, gaseous water vapor filled the air when the liquid water began to boil, and solid water in the form of ice cubes cooled your lemonade!Īll of these changes in the state of water involved transfers of heat and thermal energy.
However, you were a firsthand witness to some interesting scientific principles. You probably weren't thinking about school subjects, like science, while you were helping prepare dinner. You fill a glass with ice cubes and pour lemonade into the glass. The only thing you're missing is a cool drink. Before long, you have tender noodles ready to be covered in delicious sauce. You put the noodles into the water while you heat the spaghetti sauce in a separate saucepan. After what seems like forever, the water finally begins to boil, bubbling a spray of steam into the kitchen air. You place it on the stove and turn the burner on high. You get out the big metal spaghetti pot and fill it with water from the sink. You get excited, because you know what that means: spaghetti time! You bound into the house and ask the question that's on every student's mind: what's for dinner? Your parents ask if you want to help prepare dinner with them tonight. It's Friday afternoon and you're finally home from school after a long week.
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