Kilograms
- Abbreviation/Symbol:
- Unit of:
- Worldwide use:
- Description: The kilogram is the base unit of mass in the International (SI) System of Units, and is accepted on a day-to-day basis as a unit of weight (the gravitational ...
What does kg stand for in the metric system?
The metric system is a system of measurement that uses the meter, liter, and gram as base units of length (distance), capacity (volume), and weight (mass) respectively. What is SI unit of mass? The SI unit of mass is the kilogram (kg).
What would a kilogram be used to measure for?
Worked example 6: Calculating cost from weight
- Write the amount of sand needed in kg.
- Calculate the total amount of money he will have to spend to buy enough sand for the project.
- If sand is only sold in 50 kg bags, how many bags will Mr Booysens need to buy?
How do you calculate kg?
if your calculator has a square function, divide weight (kg) by height (cm) squared, multiply by 10,000 and round to one decimal place. if your calculator does not have a square function, divide weight by height twice as shown in the calculation formula above, multiply by 10,000 and round to one decimal place.
How does a kilogram compare to a pound?
A kilogram weighs more than a pound.Because they are both units of weight, both kilograms and pounds can be compared directly, and there are 2.2 pounds in 1 kilogram.To convert a number of kilograms to pounds, multiply the number of kilograms by 2.20.
What are kg used to measure?
masskilogram (kg), basic unit of mass in the metric system. A kilogram is very nearly equal (it was originally intended to be exactly equal) to the mass of 1,000 cubic cm of water.
Why is kg used for weight?
Since there is no practical easy way to measure mass, in everyday life we use the kilogram as a unit of weight assuming that the gravitational field is fairly constant around earth. However scales have to be calibrated locally to compensate the slight gravitational field variation in different places.
What Units are kg?
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 x 10–34 when expressed in the unit J s, which is equal to kg m2 s–1, where the metre and the second are defined in terms of c and ΔνCs.
Is kg a weight or mass?
massThe kilogram is the SI unit of mass and it is the almost universally used standard mass unit. The associated SI unit of force and weight is the Newton, with 1 kilogram weighing 9.8 Newtons under standard conditions on the Earth's surface.
What is a kg based on?
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10-34 when expressed in the unit J s, which is equal to kg m2 s -1 , where the meter and the second are defined in terms of c and ∆νCs.
What is kg mass?
Medical definitions for kilogram The base unit of mass in the International System of Units, equal to 1,000 grams (2.2046 pounds).
What units are used to measure weight?
Glossary: Mass (weight) Units. The Metric System of Measurements uses the mass units: gram (g), kilogram (kg) and tonne (t).
What is mass measured in?
kilogram (kg)The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g). To measure mass, you would use a balance. In the lab, mass may be measured with a triple beam balance or an electronic balance, but the old-fashioned balance pictured below may give you a better idea of what mass is.
What is the difference between a pound and a kilogram?
A kilogram is very nearly equal (it was originally intended to be exactly equal) to the mass of 1,000 cubic cm of water. The pound is defined as equal to 0.45359237 kg, exactly. Read More on This Topic.
Where is the kilogram kept?
The standard kilogram was kept at the International Bureau of Weights and Measures laboratory at Sèvres, France. However, in 1989 it was discovered that the prototype kept at Sèvres was 50 micrograms lighter than other copies of the standard kilogram.
What is the standard unit of mass?
measurement system: Mass: kilogram. The standard for the unit of mass, the kilogram, is a cylinder of platinum-iridium alloy kept by the International Bureau of Weights and... As originally defined, the kilogram was represented in the late 18th century by a solid cylinder of platinum.
Why do we use the kilogram as a weight?
Since there is no practical easy way to measure mass, in everyday life we use the kilogram as a unit of weight assuming that the gravitational field is fairly constant around earth. However scales have to be calibrated locally to compensate the slight gravitational field variation in different places. 1.2K views. ·.
What is the force of one kilogram?
When we use kilograms to measure weight, we are actually referring to kgf or kilogram-force. From Wikipedia: One kilogram-force is equal to the magnitude of the force exerted by one kilogram of mass in a 9.80665 m/s2 gravitational field. In other words, the weight (force) of one kg is equal to one kgf, or 9.8N. 8 views.
What is weight measured in?
Weight is commonly measured in Newtons or Kg-wt. In short, Mass is a measure of the amount of matter in an object and Weight is the amount of force that gravity has on an object. Related Answer. Howard Ludwig.
What determines the weight of an object?
Gravity, which is created by the mass of an object, moves towards the center of the object and it is gravity that determines your, or any other object's, weight.
What is the unit of force?
The unit of force was named for him, while the ancient Latin & Greek word gram (small weight) was used to define mass. ( humorous note: a "weight" was used to define "mass"!) Of course, the gram is rarely used, as the kilogram was the natural size unit. TODAY.
What would happen if a man took 100 kg of mass to the moon?
If however, instead of a scale, he took a balance and 100 kg mass to the moon, he would be able to measure his actual mass, because the scale would stay in balance regardless of how much, or how little, the gravitational pull was. He would discover that his mass had remained unchanged.
How does the weight of an object change based on where it is?
If you've decided to visit the moon to test out this theory then you'll find that, in a matter of hours, you will have slashed your weight by two thirds. Weight is a vector and its direction of pull is towards the center of the planet you're stood on.
How much does a kilogram weigh?
One kilogram is almost similar to 2.2 pounds. You start to observe this common thing. So, you can learn about this measurement while you do Supermarket shopping. Let’s make lists of common things that weigh one kilogram or almost close to it.
How many medium apples to compare to 1kg?
Now, we have fruits as an example. In this reading, we will use an apple of medium size. You can take six medium sizes of apples to compare with 1kg weight.
How much does a pineapple weigh?
It depends on the variety, and the measurement range starts from two pounds. However, the freshest pineapple in grocery stores weighs roughly 2.0 pounds.
How many sweet potatoes are in a pound?
When you take a bunch of sweet potatoes, you might wonder how much it weighs. If one pound of sweet potatoes is similar to three mediums, you need six to seven sweet potatoes to meet two pounds or 1kg.
How much does a pack of ground beef weigh?
This kind of meat has less fat compared to the other part. You don’t need to worry because it will not lessen its flavorful bite. One pack has weighed approximately one pound. Thus, if you take two packs of ground beef, it means around one kilogram.
How much does a small laptop weigh?
A Small Laptop. The small size of the laptop might weigh around 2.2 pounds. It is lightweight for a laptop. Be sure it is for a small laptop with a standard model. Although your small portable laptop is thin, it weighs approximately one kilogram. So, it is easy and surprisingly light for you to carry everywhere.
What is the unit of measurement for coal?
25. The kilogram-metre (or more often the kilogram-kilometre) is a unit of measurement indicating that 1 kg (lets assume of coal) has been moved 1 km (towards, for example, a power station). It's used by big freight companies, governments etc. as one metric of how much hauling they're doing.
What does "meters per second" mean?
Meters per second just (usually) means how many meters are traversed by an object each second. Simple. But I don't really have a mental conception of what it means when units are multiplied, e.g. a kilogram-meter. Can anyone explain in simple physical terms what a kilogram-meter is?
What is a joule in math?
A Joule is a newton-meter, that is, k g m 2 s 2. The combined units in the numerator k g m 2 make you think “mass-area”, but in reality the kilograms, the metres, and the other metres are all separate quantities. Divide them by seconds, and you get angular momentum, or action. Divide again, you get force.
Overview
The kilogram (also kilogramme ) is the base unit of mass in the International System of Units (SI), the metric system, having the unit symbol kg. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo colloquially. It means 'one thousand grams'.
The kilogram is defined in terms of the second and the metre, both based on fixed fundamental constants of nature. This allows a properly-equipped metrology laboratory to calibrate a mass m…
Definition
The kilogram is defined in terms of three fundamental physical constants: The speed of light c, a specific atomic transition frequency ΔνCs, and the Planck constant h.
According to the General Conference on Weights and Measures (CGPM)
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixe…
Name and terminology
The kilogram is the only base SI unit with an SI prefix (kilo) as part of its name. The word kilogramme or kilogram is derived from the French kilogramme, which itself was a learned coinage, prefixing the Greek stem of χίλιοι khilioi "a thousand" to gramma, a Late Latin term for "a small weight", itself from Greek γράμμα. The word kilogramme was written into French law in 1795, in the Decree of 18 Germinal, which revised the provisional system of units introduced by the French National …
Kilogram becoming a base unit: the role of units for electromagnetism
It is primarily because of units for electromagnetism that the kilogram rather than the gram was eventually adopted as the base unit of mass in the SI. The relevant series of discussions and decisions started roughly in the 1850s and effectively concluded in 1946. By the end of the 19th century, the 'practical units' for electric and magnetic quantities such as the ampere and the volt were well established in practical use (e.g. for telegraphy). Unfortunately, they were not coherent with …
Redefinition based on fundamental constants
The replacement of the International Prototype of the Kilogram as the primary standard was motivated by evidence accumulated over a long period of time that the mass of the IPK and its replicas had been changing; the IPK had diverged from its replicas by approximately 50 micrograms since their manufacture late in the 19th century. This led to several competing efforts to d…
SI multiples
Because an SI unit may not have multiple prefixes (see SI prefix), prefixes are added to gram, rather than the base unit kilogram, which already has a prefix as part of its name. For instance, one-millionth of a kilogram is 1 mg (one milligram), not 1 μkg (one microkilogram).
• The microgram is typically abbreviated "mcg" in pharmaceutical and nutritional supplement labelling, to avoid confusion, since the "μ" prefix is not always well recognised outside of technic…
See also
• 1795 in science
• 1799 in science
• General Conference on Weights and Measures (CGPM)
• Gram
• Grave (original name of the kilogram, its history)
Notes
1. ^ The avoirdupois pound is part of both United States customary system of units and the Imperial system of units. It is defined as exactly 0.45359237 kilograms.
2. ^ The French text (which is the authoritative text) states "Il n'est pas autorisé d'utiliser des abréviations pour les symboles et noms d'unités ..."