Question

Which instrument is employed to live body temperature?
A) Isotherm
B) Thermogram
C) None of those
D) Thermometer

Answer 1

Hint: One among the foremost common devices for measuring temperature is that the glass thermometer. This consists of a glass tube crammed with mercury or another liquid, which acts as the working fluid. Temperature increase causes the fluid to expand, therefore the temperature is often determined by measuring the quantity of the fluid.

Complete answer: A thermometer consists of two important elements: (1) a temperature sensor (like the bulb in case of mercury thermometer) during which some change occurs with a change in temperature; and (2) some means of converting this alteration into a numerical value.
Calibration
Thermometers are usually calibrated either by comparing them with some other calibrated thermometers or simply by checking them against known fixed points on the scale . The simplest known of those fixed points are the melting and boiling points of pure water.
Types of Thermometer
A) Digital thermometer - A digital thermometer is the most accurate and quickest thanks to taking a temperature. Digital thermometers are common in drug stores and supermarket pharmacies. A digital thermometer has three alternative ways to use it. These include: Oral, rectal, and axillary.
B) Oral thermometer - Oral temperatures are often taken by either a digital or mercury-in-glass thermometer .
C) Digital ear (tympanic) thermometer - It measures the temperature inside the auditory meatus through heat ray technology.
D) Forehead (temporal) thermometer - It uses infrared sensors to live the temperature of the superficial cerebral artery , which may be a branch of the arteria carotis .
E) Mercury (liquid in glass) thermometer - Mercury thermometers provide accurate temperature readings and may be used orally, rectally, or under the arm.

Thus, the right option is D.

Note: The primary real medical thermometer was invented by Sir Thomas Allbut in 1867. it had been six inches long and took about five minutes to require an individual's temperature. for nearly 100 years thermometers were basically unchanged. The alcohol or mercury present inside it were considered to be very accurate for measuring temperature.