kˌæloːɹˈɪmᵻɾɚz slˈoʊ pˈɑːɹɾɪkəlz dˌaʊn ænd ɐbsˈoːɹb ðɛɹ ˈɛnɚdʒi ˌɪntʊ ɐ mətˈɪɹiəl, ɐlˈaʊɪŋ ðæt ˈɛnɚdʒi təbi mˈɛʒɚd.
Calorimeters slow particles down and absorb their energy into a material, allowing that energy to be measured.