science

• what is length


  length is generally measured using rulers and measuring tapes .short distances are measured in centimeters [CM] or millimeters [MM].long distances are measured in kilometers [KM]
• what is volume


  volume is a measure of the space occupied by a substance.
• what is volume measured in 


  volume is measured in cubic units such as METER CUBE,CENTIMETER CUBE etc.
• what are the 2 things that volume can be calculated by?


  =direct method

  =in-direct method
• how did ancient romans measure time

  they developed the sand clock to measure the time
• how did the Greeks measure the time


  they developed the water clock to measure the time.
• what was the name of the clock that was the first to accurately measure the time with equal intervals

  pendulum clock
• what are the devices that we use nowadays to measure the time

  =advanced clock

  =watches

  =stopwatch

  =digital clock
• what is one oscillation


  one oscillation is the motion of a pendulum starting from one extreme end to another extreme end and back to the first extreme end.
• what is temperature

  temperature is the degree of hotness or coldness of an object .
• what is the SI unit for temperature

  the SI unit for temperature is kelvin[donated by k] but more commonly used units of temperature are degree Fahrenheit [donated by f] and degree Celsius [donated by c].
• how is temperature expressed by

  temperature is expressed by adding degree Celsius to indicate that the temperature has been recorded on Celsius scale
• who developed the kelvin scale

  lord William Thomas 1st baron kelvin
• what are the commonly used thermometers

  =laboratory thermometer

  =clinical thermometer

  =bimetallic thermometer
• what is the SI unit for mass


  the SI unit for mass is kilogram [donated by KG] .large mases are measured in Tonnes and small masses are measured in milligram[donated by MG]
• what is the mass multiplied by to get the weight of the object 


  the mass is multiplied by 9.8 to get the weight of the mass
• what does accuracy mean


  accuracy means how close the measured reading is with the true value of the quantity
• what does reliability mean


  reliability means how consistent the readings are every time the activity is carried out
• what are physical quantities


  the quantities that can be measured are known as a physical quantity
• what are the 2 types of physical quantites 


  =base quantities

  =derived quantities
• explain base quantity


  base quantities are those quantities that are distinct in nature and cannot be expressed in the form of other quantities
• explain derived quantites

  derived quantities are the physical quantites that are defined and culculated in terms of fundermental quantites
• what is measurement


  measurement is the process of comparing /expressing an unknown quantity wit a known quantity
• what are 2 components that measurement is divided into 


  =unit of measurement

  =magnitude