Why a doctor dips the thermometer in a liquid before use? That liquid is actually, alcohol. Since the thermometer is kept beneath the tongue, it needs to be cleaned to use it again. Therefore doctor dips the thermometer in alcohol, which acts as a disinfectant, to clean the thermometer.
Why does the liquid inside the tube of the thermometer go up and down?
The liquid in the thermometer goes up when the thermometer is heated because heating makes the alcohol molecules of the liquid move faster. The tube in the thermometer that contains the red liquid is very thin so that it is easier to see the liquid move up and down.
Why do thermometers use a liquid instead of a solid or a gas?
Liquids are used in thermometers because they expand and contract with temperature changes and they take on the shape of a container without filling it. Solids do not work in thermometers because they do not take on the shape of the container.
What do thermometers actually detect?
A thermometer is an instrument that measures temperature. It can measure the temperature of a solid such as food, a liquid such as water, or a gas such as air. The three most common units of measurement for temperature are Celsius, Fahrenheit, and kelvin. The Celsius scale is part of the metric system.
What do you know about a substance if you know it's temperature?
In chemistry, we define the temperature of a substance as the average kinetic energy of all the atoms or molecules of that substance. Not all of the particles of a substance have the same kinetic energy. At any given time, the kinetic energy of the particles can be represented by a distribution.
What do you know about a substance?
A substance is simply a pure form of matter. In other words, a substance is matter than contains only one type of atom or molecule. Elements are the simplest form of matter, which means they cannot be broken down into smaller components physically or chemically.
What is temperature really a measure of?
average kinetic energy
At which temperature is the kinetic energy of a substance the least?
0 in the Kelvin scale is the lowest possible temperature, absolute zero, -273° C, -460° F. When two things in contact have different temperatures, energy will move from the warmer object to the cooler one.
What is the difference between temperature and kinetic energy?
Temperature is a measurement of the average kinetic energy of the molecules in an object or a system. Kinetic energy is the energy that an object has because of its motion. As the molecules of a solid vibrate faster their temperature increases.
What is the relationship between temperature and kinetic energy answers?
Kinetic energy is directly proportional to the temperature applied. Basically with increase in temperature the vibration / collision of molecules increase hence kinetic energy increases.
What is the effect of temperature on kinetic energy?
With the increase in temperature the kinetic energy of the particles increases and starts moving faster. The kinetic energy of the particles is more in gases and least in solids.
What is the effect of temperature on kinetic energy and why?
When heat energy is added to a substance, this results in an increase in the kinetic energy of its particles, that is, the particles move at higher speeds. Since temperature is a measure of the average kinetic energy, the temperature increases.
Why does kinetic energy increase with temperature?
If the temperature is increased, the average speed and kinetic energy of the gas molecules increase. If the volume is held constant, the increased speed of the gas molecules results in more frequent and more forceful collisions with the walls of the container, therefore increasing the pressure (Figure 1).
What happens when temperature and kinetic energy from matter decreases?
As a sample of matter is continually cooled, the average kinetic energy of its particles decreases. Eventually, one would expect the particles to stop moving completely. Absolute zero is the temperature at which the motion of particles theoretically ceases.
What are the three states of matter in order of decreasing kinetic energy?
Solid particles have the least amount of energy, and gas particles have the greatest amount of energy.
What is the lowest possible temperature?
Absolute zero, technically known as zero kelvins, equals −273.15 degrees Celsius, or -459.67 Fahrenheit, and marks the spot on the thermometer where a system reaches its lowest possible energy, or thermal motion. There's a catch, though: absolute zero is impossible to reach.
What are the three main points of the kinetic theory of matter?
The simplest kinetic model is based on the assumptions that: (1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size; (2) the molecules undergo perfectly elastic collisions (no energy loss) with each other and with the …
What are the 4 assumptions of the kinetic theory?
The kinetic-molecular theory of gases assumes that ideal gas molecules (1) are constantly moving; (2) have negligible volume; (3) have negligible intermolecular forces; (4) undergo perfectly elastic collisions; and (5) have an average kinetic energy proportional to the ideal gas's absolute temperature.
What is kinetic theory of matter in physics?
The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion. The degree to which the particles move is determined by the amount of energy they have and their relationship to other particles.
