please help me to do this question
a) Precautions:
- Wash the thermometer before and after use with an antiseptic solution, and handle it with care.
- See that the mercury levels are below 35 degrees and don’t hold the thermometer near its bulb.
- While noting down the reading in the thermometer, place the mercury level along with the eyesight.
- Do not place the thermometer in a hot flame or in the hot sun.
With our hand above the flame we will receive heat from both radiation and convection. The convected heat flow is upwards. The hottest part of a flame is the position where the most intense combustion is occurring. If you look at a flame there is usually a small more transparent area near the base of the flame. The boundary between this and the bright area above the center of the flame is the hottest area. With our hand above the flame receives heat by convection and the hottest area of the flame comes in contact with our hand directly and it will burn.
When we hold our hand beside a flame the radiated heat will reach us (it radiates out in all directions like the light), but not much of the convected heat, and we will not get heat from convection unless a burning spark flies out and comes in contact with us directly.
Hence we cannot keep our palm above a burning candle but can keep it on the sides of a candle flame.
c) In summer white fabric (as black color absorbs radiation more) should be chosen, as black color absorbs and emit radiation more readily.
d) In a clinical thermometer kink plays an important role. kink prevents the mercury present in the capillary to fall back in the bulb. So it separates the mercury at high temperature and cool mercury and allows the user to note the reading when the thermometer is taken out.
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