" In this experiment, you will monitor conductivity during the reaction between sulfuric acid, H2SO4, and barium hydroxide, Ba(OH)2, in order to determine the equivalence point. From this information, you can find the concentration of the Ba(OH)2 ...

Temperature sensors are often built from electronic components called thermistors. A thermistor is a device whose resistance varies with temperature (the name comes from a combination of the terms "thermal" and "resistor"). Typical thermistors are ma...

Magnetism is a property of matter that results in a force of attraction or repulsion between materials with magnetic properties. Not all materials have magnetic properties. When a material does have magnetic properties, we say it can be magnetized, a...

Land breezes and sea breezes refer to winds that often occur near an ocean or lake. Land breezes blow from the land to the water while sea breezes blow from the water to the land. Both of these breezes are caused by uneven heating of the Earth's surf...

Have you ever wondered how shoe companies decide what kind of sole to put on the bottom of their shoes? This activity explores the heat produced by friction on different sole materials. You will rub a Temperature Probe back and forth across several ...

Since the earliest days of medicine, heart rate has been recognized as a vital sign (an indicator of health, disease, excitement, and stress). Medical personnel use heart rate to provide clues as to the presence of many medical conditions. Reflex cha...

One of the homeostatic mechanisms of the human body serves to maintain a fairly constant blood pressure. Major determinants of blood pressure are heart rate, amount of blood pumped with each beat (stroke volume), and the resistance of the arterial sy...

Since the earliest days of medicine heart rate has been recognized as a vital sign—an indicator of health, disease, excitement, and stress. Medical personnel use the heart rate to provide clues as to the presence of many medical conditions. Reflex ...

An electromyogram, or EMG, is a graphical recording of electrical activity within muscles. Activation of muscles by nerves results in changes in ion flow across cell membranes, which generates electrical activity. This can be measured using surface e...

The automatic response of a muscle to a stimulus is called a reflex. The patellar reflex results from tapping the patellar tendon below the knee with a reflex hammer. This causes contraction of the quadriceps muscle and extension of the leg. Stretchi...