a Liquid-in-Glass Thermometer
the instrument with care - the glass bulb is easily broken.
the bulb in the substance and wait until the thread in the tube
settles to a steady value - it takes time for a liquid to expand
is best to keep the bulb immersed all of the time otherwise the
thermometer will start to adjust to room temperature - if you have
to leave it standing in the container be careful to check the stability
of the apparatus before you let go of it - otherwise make sure that
it has time to adjust before you take the next reading!
Take care - while
holding a thermometer as you heat a container of liquid you have
to make sure you do not burn yourself or set fire to the sleeve
of your labcoat.
gently for about ten seconds before you intend to take the reading
- some parts may be hotter or cooler than others
the reading at eye level (care if heating not to set your hair alight!)
check that you understand what each division on the scale represents
and get a friend to check the reading.