English Conversation about Physics

Topic of  Discussion : Dimensions

Rizal      : Okay, welcome to educational discussion with me, Risaldi Putra. In this time we will discuss about dimensions of a physical quantity. Before we start our discussion, I will introduce our resource person for this time. They are Fuji Prasetyo and Bavitra. Good morning Fuji. How are you today?

Fuji        : I’m fine, thanks.

Rizal      : And how are you Bavitra? I hope you are fine too.

Bavitra   : Thank you, I’m fine.

Rizal      : Well, let’s we begin our discussion with the first question. Can you tell us what is the meaning of dimensions?

Fuji        : Okay. In physics, the dimension of quantity indicates the nature of the quantity.

Rizal      : How about you, Bavit?

Bavitra   : I think Fuji’s statement is true. In dimension, it has seven dimensions of basic quantity.

Rizal      : Can you mention it, Bavit?

Bavitra   : Okay. First, the dimension of length is L, the dimension of mass is M, the dimension of time is T, the dimension of temperature is θ, The dimension of electric current is I, the dimension of  luminous intensity is J and the  last… The dimension of amount of a substance is N.

Fuji        : And in dimensions, it has many dimension of derived quantity. An example, the dimension of acceleration. We know that the unit of acceleration is m/s². m is the unit of  length, and the dimension of length is L.  And s is the unit of time, and the dimension of time is T.  So, we get the dimension of acceleration is L/T² or LT  ̄².

Rizal      : That’s good explanation. But, has a constant dimension?

Bavitra   : A constant in physics. It has no dimension.

Rizal      : Okay. Thank you for Fuji and Bavitra. Well, we will continue our discussion after these commercial break. So, don’t go anywhere!