How does bulb size affect thermometer?

How does bulb size affect thermometer?

Using a thermometer with a smaller bulb – A smaller bulb contains less mercury and therefore absorbs heat in a shorter moment in time. A glass bulb with thinner wall – Heat can be transferred to the bulb straightforwardly.

In which thermometer the stem and bulb are longer?

glass thermometer
A glass thermometer consists of a stem and bulb. The stem (long part) of the thermometer has a hollow shaft running almost the entire length of the stem. The bulb of the thermometer contains a small amount of mercury, a metal that is liquid at ordinary temperatures.

Why thermometer should not be held from the bulb?

Answer: When reading a thermometer, it is recommended that we do not hold it by its bulb because the mercury in the bulb will expand owing to our body temperature and affect the actual reading.

What increases the range of thermometer?

The range of a liquid-in-glass thermometer is limited by the length of the thermometer and can be increased by: increasing the diameter of the capillary – this means that the liquid will not expand as far along the tube per degree rise in temperature.

Why can’t doctors use laboratory thermometers?

We cannot use a laboratory thermometer in the clinics. A laboratory thermometer cannot be used to measure body temperature because it’s range is generally -10°C to 110°C, while normal body temperature is 37°C. Thus doctor do not use laboratory thermometers to measure body temperature of human beings in the clinics.

Why is it advised not to hold the thermometer by its bulb while reading it draw a Labelled diagram of clinical thermometer?

It is advised not to hold the thermometer by its bulb while reading it because if we hold a thermometer by its bulb, the mercury in the bulb will expand due to our body temperature and effect the actual reading.

Why is it advised not to hold the thermometer by its ball while reading it?

Solution: It advised not to hold the thermometer by its bulb while reading it because the actual reading of human body temperature will get affected. This is for the reason that level of Mercury raises due to human body temperature. The standard way to hold the thermometer is from its top end.

What is the thermometer bore?

The Stem and Capillary Bore Magnified glass makes up the outside jacket of the thermometer, which is called the stem. A thin bore inside the stem gives mercury a route of travel as it expands and contracts. The thin bore is called a capillary. Magnified glass makes reading the mercury level easier.

How does a thermometer with a large bulb work?

How Thermometers Work. It also cannot measure temperatures above 212 degrees F / 100 degrees C (the water would boil). Because the “bulb” (the jar) is so large, it takes a long time for the thermometer to reach the same temperatures as the object it is measuring — perhaps an hour.

What kind of liquid is in a bulb thermometer?

­ The bulb thermometer is the common glass thermometer you probably grew up with. The thermometer contains some type of fluid, generally mercury. Bulb thermometers rely on the simple principle that a liquid changes its volume relative to its temperature.

What’s the difference between a glass and blunt thermometer?

Glass Rectal Thermometers. (1) The bulb of a rectal thermometer is short and thick in order to protect the rectum (figure 2-5 B ). A long, slender bulb tip could accidentally injure the patient by penetrating the walls of the rectum. A blunt tipped thermometer is much less likely to damage the rectum.

Why do you put Mercury in glass thermometer?

­ Sealing mercury in a small glass thermometer solves these problems. The small size of the bulb means that the bulb reaches the temperature of what it is measuring very quickly, and the tube in such a thermometer is micro-fine. Mercury also avoids the freezing and boiling problems associated with water.