1.1.1 Understanding base units

• What are the base units and symbols for the quantities listed?

  • Length: meter (m)
  • Mass: kilogram (kg)
  • Time: second (s)
  • Electric current: ampere (A)
  • Temperature: kelvin (K)
  • Amount of substance: mole (mol)
  • Luminous intensity: candela (cd)
• What is the symbol for temperature?

  T
• What distinguishes base units from derived units?

  Base units cannot be broken down into simpler units
• What is the base unit for luminous intensity?

  candela
• What is the base unit for length?

  meter
• What does the ampere (A) measure?

  Electric current
• What does the kilogram (kg) measure?

  Mass and weight
• How do base units relate to derived units in physical measurements?

  Base units define all other derived units
• What is the symbol for time?


  t
• What is the difference between base units and derived units?

  • Base Units:
  • Fundamental units
  • Independent of each other
  • Examples: meter, kilogram

  
  

  • Derived Units:
  • Combined from base units
  • Depend on base units
  • Examples: speed (m/s), force (N)
• What is the base SI unit for time?

  Second (s)
• What is the base unit for time?

  second
• What is the base unit for electric current?

  ampere
• How do symbols for base units contribute to scientific communication?

  They provide a standardized way to express measurements
• What is the symbol for luminous intensity?

  Iv
• What does the symbol 'm' represent in scientific measurements?

  Meter
• What does the symbol 'A' represent in scientific measurements?

  Ampere
• What does the symbol 'kg' represent in scientific measurements?

  Kilogram
• What is the relationship between base units?

  They are independent of each other
• What is a base unit?

  A fundamental unit of measurement
• What is the base unit for temperature?

  kelvin
• What does the symbol 's' represent in scientific measurements?

  Second
• What is the ideal gas equation?

  $PV =$$nRT$
• What does the symbol 'K' represent in scientific measurements?

  Kelvin
• What does the second (s) measure?

  Time
• What is the base SI unit for length?

  Meter (m)
• What is a base unit in the SI system?

  A cornerstone of physical measurement
• What does the meter (m) measure?

  Distance and length
• Why are base units important in physical measurements?

  They allow us to define all other units
• How do you calculate the temperature (T) using the given PV equation?

  To calculate the temperature (T):

  T = (PV)/(nR)

  Where:

  P = Pressure (2 atm)

  V = Volume (1 L)

  n = Amount of substance (0.500 mol)

  R = Gas constant (0.08206 atm·L·mol^-1·K^-1)
• Why are base units important in the SI system?

  They form the foundation for all other units
• What is the base unit for amount of substance?

  mole
• How are base units defined?

  By the International System of Units (SI)
• Why are the seven base SI units important?

  They are fundamental units that cannot be broken down
• What is the symbol for mass?

  m
• What is the symbol for electric current?

  I, i
• How is speed related to base units?

  Speed is a derived unit from length and time
• What is the base SI unit for temperature?

  Kelvin (K)
• What does the symbol 'mol' represent in scientific measurements?

  Mole
• What does the symbol 'cd' represent in scientific measurements?

  Candela