units and measurements

Q: Why do scientists use a shared measurement system?

A: To avoid confusion, ensure accuracy, and compare results easily worldwide.

Q: What is the name of the internationally agreed system of measurement used in science?

A: SI Units (Système International d'Unités), based on the metric system.

Q: What does SI stand for?

A: Système International d'Unités

Q: What SI unit is used for length?

A: Meter (m)

Q: What SI unit is used for mass?

A: Kilogram (kg)

Q: What SI unit is used for time?

A: Second (s)

Q: What SI unit is used for temperature?

A: Kelvin (K)

Q: What does a balance measure?

A: Mass

Q: What unit is used with a balance?

A: Grams (g) or kilograms (kg)

Q: When would you use a balance?

A: To find out how heavy something is (its mass)

Q: What does a thermometer measure?

A: Temperature

Q: What units are used with a thermometer?

A: Degrees Celsius (°C) or Kelvin (K)

Q: When would you use a thermometer?

A: To check how hot or cold something is

Q: What does a measuring cylinder measure?

A: Volume of liquids

Q: What units are used with a measuring cylinder?

A: Milliliters (mL) or liters (L)

Q: When would you use a measuring cylinder?

A: To measure exact amounts of a liquid

Q: How do you prepare a measuring cylinder for an accurate reading?

A: Place it on a flat surface and get eye level with the liquid.

Q: What is the meniscus, and how do you read it?

A: The meniscus is the curved surface of the liquid. Always read the volume from the bottom of the curve at eye level.

Q: What is parallax error, and how do you avoid it?

A: It's an error caused by viewing the liquid from the wrong angle. To avoid it, always read the scale straight across at eye level.

Q: What is the SI unit for length?

A: Meter (m)

Q: What is the SI unit for mass?

A: Kilogram (kg)

Q: What is the SI unit for time?

A: Second (s)

Q: What is the unit used for temperature?

A: Degree Celsius (°C)

Q: What is inertia and how is it related to mass?

A: Inertia is an object's resistance to changes in motion (starting, stopping, or changing direction). It is not measured directly, but objects with more mass have more inertia, meaning they are harder to move or stop.

Q: What is mass and how is it measured?

A: Mass is the amount of matter in an object. It is measured in kilograms (kg). More mass means the object is heavier.

🧠 Mass vs. Weight

Mass is the amount of matter in an object. ➤ It stays the same everywhere in the universe. ➤ Measured in kilograms (kg).

Weight is the force of gravity acting on an object’s mass. ➤ It changes depending on gravity (e.g., different on the Moon). ➤ Measured in Newtons (N) because it's a force. flashscards

🧠 What is Density?

In Words:

Density is how much mass is packed into a certain volume. It tells you how heavy something is for its size.

🔢 Density Formula (Equation):

Density=Volume/Mass​

explaune how the desity of an object determines wheather it sinks or floats

if the objects density is less then the liquid= floats

if the objects density is denser then the liquid -= sinks

descrive how to find mass, volume, and desnity of regulare and irregualre objects

mass- balance scale volume- ruler units cm or m - eureaka can = measure how much water spills out