# Pure silicon and thermometers

1. Feb 19, 2004

### Magna1

Its been a rough week I have posted 3 times.

A digital thermometer uses pure silicon thermistor as its sensing element. When it is used to measure the temp of a sick child the element drops to 99.06% of its normal value at standard body temp of 37 degrees. What is the temp of the sick child?
What formula do I use R=R{original}[1+(rho)*temp change] But where do I plug in this percentage?
I don't get it?
HELP

2. Feb 21, 2004

### Integral

Staff Emeritus
It would be easier to help you if you defined all of the terms in your post.

Assuming that you are looking for change in R the percentage change would be:

$$\frac {R_O - R} {R_0}$$

So what is the rho?

Edit: LaTex error.

Last edited: Feb 21, 2004