Ear Thermometers

The latest addition to a long line of thermometersinfluenced by the warm water in the
is the ear thermometer.This type ofsaucepan.The water in the jar will expand and rise
thermometer is especially convenient to use onmore up the straw the warmer it becomes.So
children and babies.The German Theodore Hannesnow you see the basic workings of a
Benzinger invented the first ear thermometerthermometer.So as the water rises up the straw
with Englishman David Phillips inventing the firstit shows how much warmer it is becoming.Of
infra-red ear thermometer in 1984.Thermometerscourse to need some numerical scale to show
are used to detect or measure changes inexactly how warmer the water is becoming.If
temperature.Thermometers can be found almostyou want to go further with your experiment or
anywhere.In the home,the oven thermometeryou are doing this with children you can devise
keeps the heat for cooking at a setyou own measuring scale.
temperature.In the fridge the thermometer keepsToday thermometers use the readings of celcius
the cold temperature at a selected level.In heatingand Fahrenheit.In devising their own particular
appliances as well the thermometer monitorsscales,Fahrenheit decided that the boiling and
designated set temperatures.And of course in thefreezing points of water would be separated by
medical profession thermometers are used to180 degrees,whilst Celcius decided upon separating
check the temperatures of patients.the two by 100 degrees.Celcius is the most used
To understand the concept and workings of anow in scientific issues and the majority of
thermometer perhaps it is best to make you owneducational purposes.
simple thermometer at home and observe.To doThermometers have evolved considerably over
this you will need a jam jar with a water tightthe centuries to todays day and age where they
lid,some plumbers putty and a drinking straw.Firsthave become digital and very easy to the
of all make a hole just big enough for the drinkinguse.The ear thermometer is a perfect tool for
straw to fit into in the lid of the jam jar.Insert theany parent with young children to own.They give
straw into the hole and seal around the straw ina very accurate temperature reading within
the hole to prevent any leakage.Next place theseconds of being placed in the ear.The eardrum
jar on a table and fill upto the brim with very coldshares its blood supply with the temperature
water.When this has been done put the lidcontrol centre of the brain.So it’s a logical
containing the straw back onto the jar.You mayprogression to proceed and devise methods of
lose a little of the water when you do this but it isreading body temperatures from the ear.
of no concern.Ok so now we are ready for theFor those of you that do not already own one of
main part of the experiment.Find yourself athese devices,it is highly recommended that you
saucepan and fill it a little with vey warm or hotgo out and purchase one.A very useful implement
water.Now place the jam jar with the very coldto have in the household and makes the task of
water into the saucepan.What you will see next istaking body temperatures very easy and
the water in the jam jar rising up the straw.This isaccessible.
because of the water changing temperature