• Métodos

• El Método Científico
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Did you know that there are many ways to go about finding the answer to a scientific question? Scientific discovery can be sparked by various inspirations and carried out using different methods in steps that may not follow a tidy path with predictable results. Scientists may use one, several, or a combination of methods to investigate phenomena.

##### Resumen

Scientific investigation is not always a linear process that starts with a hypothesis and ends with a conclusion, as portrayed in the classic “Scientific Method.” The true scientific method is a much more dynamic and much less predictable, and can involve various methods that may overlap. This module serves as an introduction to our Practice of Science series of modules, which describe key scientific methodologies.

##### Conceptos Clave
• The scientific method is a process of discovery that does not follow a prescribed, linear pattern of steps.

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• Medida

• El Sistema Métrico
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Did you know that the metric system of measurement is used in almost every country in the world? The beauty of the metric system is that one unit of measurement is used for each type of thing measured, so volume is always measured in liters whether talking about how much water is in a single raindrop or in one of the Great Lakes.

##### Resumen

The metric system is the standard system of measurement in science. This module describes the history and basic operation of the metric system, as well as scientific notation. The module explains how the simplicity of the metric system stems from having only one base unit for each type of quantity measured (length, volume, and mass) along with a range of prefixes that indicate multiples of ten.

##### Conceptos Clave
• El sistema métrico, también conocido como el Système International d'Unités (SI), fue desarrollado a finales del siglo XVIII para estandarizar las unidades de medidas en Europa.
• El sistema métrico es el sistema principal de medida utilizado en gran parte del mundo y en la ciencia.
• Cada tipo de medida tiene una unidad base al cual prefijos son añadidos para indicar múltiplos de diez.
• La notación científica es una manera corta para escribir números bien pequeños o números bien grandes

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• Temperatura
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Did you know that in theory there can be no temperature in the universe lower than zero on the Kelvin scale, known as “absolute zero”? This is the point where every molecule stops moving. Although there are different temperature scales – Fahrenheit, Celsius, and Kelvin – they all do one thing: put a number to the heat energy possessed by an object.

##### Resumen

This module provides an introduction to the relationship between energy, heat, and temperature. The principle behind thermometers is explained, beginning with Galileo’s thermoscope in 1597. The module compares the three major temperature scales: Fahrenheit, Celsius, and Kelvin. It discusses how the different systems use different references to quantify heat energy.

• ##### NGSS
• HS-C3.5, HS-C5.3, HS-PS3.A2
##### Conceptos Clave
• La temperatura es la medida de la cantidad de energía térmica poseída por un objeto.
• Galileo desarrolló el primero instrumento para medir la temperatura, fue refinado y calibrado por científicos subsiguientes.
• Las escalas Fahrenheit, Celsius y Kelvin son tres diferentes sistemas para la medición de energía térmica (temperatura) basada en diferentes referencias.

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Did you know that submarines submerge and resurface by changing their density? Density explains why large metal ships can float and why oil and vinegar separate into layers. Density has also been used to solve crimes: around 250 BCE Archimedes used the concept to reveal that a craftsman defrauded the king by replacing gold in his crown with silver.

##### Resumen

Density is a fundamental physical property of matter. This module introduces the concept of density, explains how density is calculated, and lists the densities of common substances. The relationship between density and buoyancy is discussed. The module relates the concept of density to the operation of large ships, submarines, and hot air balloons.

• ##### NGSS
• HS-C3.5, HS-PS1.A3
##### Conceptos Clave
• La Densidad es una propiedad física de la materia que se define como la proporción de la masa de un objeto a su volumen.
• Arquímedes es acreditado por ser una de las primeras personas en considerar la densidad como una propiedad de la materia.