How Fuel Cells Work. Polymer Electrolyte Membrane (PEM) fuel cells used in automobilesâalso called Proton Exchange Membrane fuel cellsâuse hydrogen fuel and oxygen from the air to produce electricity. The diagram and animation below show how a PEM fuel cell works.
Sound is what happens when you transmit vibrations of energy through that matter. Sound is made up of wave vibrations. When you talk aloud, the motion of your vocal cords causes the air to vibrate. Air is made up of molecules, and as those air molecules vibrate, they hit each other.
Phonology is the study of sounds. Grammar is how the sounds are used to make sense. Phonology. The smallest unit of sound that can be altered to change the meaning of a word is called a phoneme.In English, for example, the words gin, kin, pin, sin, tin, and win all have different meaning due to the fact that the initial sound, or phoneme, is different. Phonemes do not have meaning by themselves.honology is the study of sounds. Grammar is how the sounds are used to make sense. Phonology. The smallest unit of sound that can be altered to change the meaning of a word is called a phoneme.